This argument severely underestimates the alternatives available to the current corporate tech hegemony. Put yourself in the position of Internet persona non grata and let’s look at your alternatives.
Twitter doesn’t like you(or whoever “Big Tech“TM goes after next)? Yet you can still say whatever they want on their own website.
YouTube doesn’t like you? You can self-host your videos.
Facebook doesn’t like you? No access to FB products then. Nobody will look for the persona non grata there anyway.
Google doesn’t like you? You can log your own traffic and use an alternative email provider, or self-host.
Unranked in SRP? Advertise in the real world or via word of mouth.
Microsoft doesn’t like you? Run Linux.
Azure/AWS doesn’t like you? Use an alternative IaaS or buy your own hardware.
Hardware vendors don’t like you? Secondhand market.
Apple doesn’t like you? Flip phone!
Linus Torvalds himself doesn’t like you!?!? OpenBSD!
The weak point that I can see in living in a world in which the Internet itself doesn’t want you is your connection itself. While there will always be free speech-focused ISPs willing to connect anyone (within the law) the backbones might decide to drop traffic headed for their website. Not much you can do about that I guess.
The internet was around before Larry Page and Sergei Brin, and Jeff Bezos, and Bill Gates, and Steve Jobs. These companies provide convenient tools which make it easy to do a few things but they are highly unnecessary for life itself, even online life. We have let them get too big. But we have not let them get too necessary.