I know it seems kinda ironic. But the way to reach lots of people is to post on YouTube. If you want to reach people and stop them from using google you're not going to reach them on some obscure platform that no one uses.
And the people using those obscure platforms have already degoogled so your basically preaching to the choir if you use them.
Wasnt yt adds laughably underpaid and thats the reason all the videos have sponsors nowdays?
With that in mind, he is big enough to switch and keep his sponsors/clicks
Only if you operate in a country where AdSense pays a lot. If you're based in a country where AdSense pays like shit, you're going to need that sponsor to keep the lights on.
The only way is to quit Youtube entirely, but It wont matter as Google already has a ton of info on him but I'm sure he has enough money to live without Youtube.