Nice tips and hacks here, I also use proton and mullvad in different occasions (personal and work).

Another thing that VPNs are very usefull in my opinion are the protection from ISPs and Govs spying and meta data collection. Of course it will be wise to use VPNs with private browsing and only login at services (mail / social etc) and latter log-off when the job is done. Having cookies from logged accounts while surfing the web is not reccomended for privacy.