You are picking very specific points. Think about the online death, if you misbehave or the google seo index misunderstand something, your business is theoratically dead.

If FB decides to suddenly block you by automoderator a few times, you lose access to your community.

If paypal bans your account by mistake or whatever, they can withold your assets in that account and you have no remedy.

These techs are like feudal lords, they can perform "virtual" violence to cut you off but most of your actions actually builds them wealth (you engage to build community, your views brings them ad money, your content may bring their advertisers sales, you using a particular service will bring them cut of any transaction that you perform, your bid on their platform will make them money despite you having zero control, you selling products on their platform will have to give them a big cut while you also need to spend more for their platform to promote your stuff etc.)

It is a bit complex and needs some deeper thought than simply looking at the surface.