Umm... pirating windows is your recomended solution?
Look don't get me wrong I could say it's if anything more cost effective for simply the dev's to say "OK anyone who has more than 1 hour of linux play time prior to this date qualifies for a refund".
Of which, most likely is a handful of people so easy work.
Screw privacy sensitivity that's a moot point. Installing windows isn't a minor tweak to a computer .First of all the suggested method is technically breaking the law. Secondly you are talking minimum adding in a windows partition, so an extra 50 GB storage on top of the amount the game takes. Comprimizes to the boot loader on the system, in which there's a high chance of messing up an existing install.
Passwords you can remember is a problem if you have multiple sites.
While I love XKCDs HorseBatteryStaplerOkay! strategy... that works well for 4-5 passwords, if you have 20+ passwords you'll pretty much wind up re-using, and if it turns out one of the 20 sites had garbage protection and gets fully hacked, any sites you used the same is also going to be vulnerable.
Personally still gotta say go with keepass or bitwarden (selfhosted if possible).