Alternative Mobile Front-ends: A list of privacy-respecting front-ends to popular online services, including social media, streaming and information services. All of the options here are mobile apps
Did people just forget what a frontend actually is?
Most of what is on this list are alternatives, not frontends.
Frontends have a specific purpose. To access a service while circumventing an undesired restriction. Such as Newpipe for YouTube or Nitter for Twitter. It is not just an alternative app or client.
Some people aren't a fan of F-droid managing the signing keys and that sometimes F-droid builds/deployments can take a bit. There is an argument for developer-managed signing keys being better than registry-managed signing keys for trust, but that also doesn't make F-droid "bad". While I'm not fully versed on it, I think the issue here only applies to the main F-droid repo since other repos might have different policies around builds and signing keys.
Personally, I like the experience of managing my most used apps through Obtanium via the devs git releases, but I only use that if the dev is good about publishing their signing key so it can be verified with AppVerifier. Otherwise, F-droid is safer than running an app installed without verifying the signing key.
The only thing I don't love about it is the home screen being what looks like a pile of random apps, rather than a category tree or something. No biggie though.