Thing was, I'd never installed Skype on the system or even signed into it for several years, and here it was out of the blue asking me to accept friend invites from a bunch of spammers. It's now part of the "desktop experience" built in I guess (it may have to do with using a Microsoft account vs. purely local account, in my discussions with others).
The feeling is I don't really have control over the OS anymore, so I think it's time to move on soon to alternatives.