Tufo can substitute pretty much everything. I myself love me a good tofuque monsieur, which is a good old ham and cheese toast only with tofu instead of the cheese, ham and bread.
Sure, but if sales inevitably drops after a large acquisition, it would be a better market for smaller players and less incentive for the megacorps to gobble up everything.
Sure, you should avoid products and vendors that lock you in or even just try to nudge you to using their other products (because that's usually how the lock-in starts). O365 changing the default save location to Onedrive comes to mind. (Insert Hank Hill onedrive meme).
I guess there can be cases where you truly don't have much of a choice.
I say we give him Mars, as long as he fucks off.