There's not really any "lock-in" with CloudFlare, though. It'd take me a day, at most, to move off of their free services.

They provide me a lot of value right now, for free. If they ever started doing something shady, I trust that people like you would cause enough of an uproar/pushback that I (and other site owners) would find out about said shady activity... and then move off CF.

I'm not as concerned with the what-ifs of what a company could do in the future as I am with their track record so far.