YouTube is testing a popup for non-Premium users that urges them to disable adblockers with a countdown timer. It emphasizes the features of YouTube Premium so its creators can be paid.
Mostly PeerTube and Odysee. Although even non-free competition (like Dailymotion and Vimeo) growing still helps, putting a dent on the botnet's monopoly.
"Botnet" is just a pejorative nod against Alphabet and the fact that, for all intents and purposes, it controls your computer quite a bit. It is not a real botnet.