[Youtube video]: Is it really that easy to hack someone's Discord? Is it the same with: Telegram, Twitter, facebook ...ect ? and does this work if I'm accessing Discord through Firefox ?

Typically, with scams like this, the attacker is using a tool like Evilginx.

The way this works is that Evilginx runs on a server that the hacker controls and will request the login page from whatever service they are targeting(Discord, Steam, Google, etc) and then serve it to you as a proxy. It looks entirely legitimate unless you make sure to very closely check the URL.

Once you login, it will take a copy of your Username, your password, and your session token(the thing that lets Discord know it's you so you don't need to login again after every refresh). and suddenly the attackers now have access to your account to do whatever they want with it.

Discord should absolutely prevent modifying links in this way specifically for this reason, but good practice as a user is to hover over every link and make sure it's pointing where it's supposed to. Don't click on anything that looks suspicious.

I struggle to call that hacking in the sense most people probably mean. Phishing is definitely a thing but they're not 'breaking' anything to access a system, they're just tricking you into giving it to them.
- Yep, this is marginally hacking, and a bit more social engineering
unless you make sure to very closely check the URL.

or you use random passwords + password manager, which auto-fill won't work in the fake domain.
They do already prevent fake links. Their markdown doesn't work if you have the http scheme in the url, which is why the link in the thumbnail says steamcommunity.com instead of https://steamcommunity.com
- Sure, but an average user is not going to know to check for the URL protocol. It's still incredibly effective for phishing
I don't understand, as you said the hacker's server requests my credits, so am I not supposed to be prompted to accept something by the browser or Discord app? Twitter and Google usually prompt you and require you to click "allow"
- You've got half of it. The hacker's server is acting as a middleman for the real login page. Everything appears legitimate except the URL will be wrong and if you use a password manager, it won't auto-fill
  
  They access the legit login page and forward it to you, but they're in the middle capturing everything you send.
  
  When you enter your login details, they will record them and then forward them to the real login window in near real time, effectively logging in as you. They then have a legitimate session token which they can use to access your account without needing to re-authenticate.

Hacking Discord is easier than anything else because every account has a passcode that you can easily obtain using regular social engineering or remote access and it bypasses everything, even 2FA.

What passcode? Are you referring to recovery codes?
- Idk anything about any recovery codes. I was referring to a thing that's called something like "security token".

Passkey is resistant to these attacks, but user adoption is not widespread enough for Discord to be able to mandate it.

Wtf, if it's such a huge security bonus, why wait for user adoption, especially if token stealing is an issue?
- Change is hard. It has been a long road to get where we are today: major OS and Browser vendor support. Users now need to change their behavior.
What is wrong with good ol’ TOTP & FIDO2?
- Passkey is FIDO2.

that steals your discord auth token

How??????

that steals your discord auth token

the general census on this thread is that he war over-exaggerating, he meant that it tricks you into inserting you Credential
- So this is just "HTML link hiding in emails" but all over again?

Someone in the comments raised a good question: how clicking a link to a third party website, exposes a discord auth token?

so, he just over-exaggerated things here, actually when you click there is a page that asks you for your creditentials and kids get tricked to enter them
- So really it's a phishing attack? Maybe he should say that instead instead of being an alarmist that clicking a link will get your credentials stolen.
  
  Every video I see of this guy is filled with disingenuous bs.

if a relevant password of theirs has been leaked then yes and yes. otherwise things get a whole lot harder.

Yes. Discord is the absolute worst fucking platform that was designed with mal-intent by a piece of shit company it's absolutely amazing anyone still uses it.

Why do you think it's "amazing" that people use it?