Microsoft is the perfect example. They've bought companies from the start, and never stopped. I still hate that they were allowed to buy GitHub. They will eventually make it supplant their stupid MSDN "devops" thing in their offerings.
But if not Microsoft, it just would have been Oracle or Amazon or someone else, and the problem is all the same. Now it's just another -- vital -- service, where I'm not the customer, and I can't ever fully trust it.
And, yes, you can argue that this didn't materially change with the Microsoft buyout, but I trusted former management's objectives for the site to run more closely to my interests than Microsoft's.