Microsoft won't force you off, but everyone - and every business - has a line in the sand somewhere. In my experience, most folks don't realize where it is until it's too late, and by then the costs are far higher (opportunity, financial, time) than they would've been with a defined strategy.

Even if you're not leaving the ecosystem anytime soon, you should always know where those lines are and what the landscape looks like on the other side of things.

I keep a VM with windows on it. Unfortunately you have to purchase a license. Hopefully I'll be able to upgrade it like they've allowed since ~Vista. But now anyone tracking user agents knows I'm not using Microsoft. I didn't even put a browser on the VM. I have used the VM under 10 times over the past year and that's usually just to use Quick Assist to help others with their Microslop OS. Sometimes to deal with a particularly obnoxious excel file.