I use linux on my desktop and laptop and dont own a running copy of windows at this point. I‘m switching from iPhone to rooted OP6 with postmarketOS atm and I host my own cloud, music, tv, websites, social media, etc.
My goal never was privacy but ownership of my devices. The privacy aspect is a neat addition.
Some of my friends still have whatsapp so I bridge to them from my matrix server. If I need to use google tools I do so in the browser. I ditched most proprietary apps at this point.
It does lead to people looking at me funny if I say „sorry, I dont use windows“ but I dont care.
I still need to get my sonos to be owned by me but thats a future project.
In summary I would say if I need proprietary stuff for a project thats no big deal. I just make sure I dont go back to using it for other things.