Mostly because cloud-connected keyloggers are mainstream. As I mentioned, Windows does it if you have their "inking and typing" setting enabled. A lot of mobile keyboard apps do it, especially if they say they use the cloud to help correct your typing.

Of course, in the case of Microsoft or Google, you presumably either have disabled the setting or you place your trust in their security practices that it is okay, because they are top tier companies, and most people send them all their private data anyways.

There are a LOT of things out there that collect everything you type these days, and rarely to people want to define them as keyloggers.