[KronisLV]

> But you can always change CDN provider in a few minutes, an hour or a day.

It depends entirely on how many of their offerings you choose to use: https://www.cloudflare.com/cloudflare-product-portfolio/

That's like saying that your application that is running in AWS can easily be moved elsewhere, but that's going to be true only sometimes: a lot of the time you'll use their managed services (which may or may not be compatible with others), their SDKs for setting up the infrastructure (which may or may not be trivial to migrate) and might end up with a lot of knowledge that's largely only valid within their ecosystem.

But that's mostly because a lot of the larger service providers out there try to expand their market reach and provide lots of different services: like I could go to my domain registrar and get either managed hosting or VPSes.