Mullvad becoming popular with huge ad campaigns is very sus. Either way I don't use it anymore because its ip ranges are banned on most websites.
I can't use Mullvad for several banks in the UK with IPv4 - if I switch to IPv6 in the app settings I sometimes can, but often I have to just disable it completely...
I can't use Youtube anonymously (i.e. without logging in) within the last month or so either, as Youtube very often won't play content due to my IP as well...