Very often. I don't trust Google-FB-MS to be my main identity provider - and a lot of stuff don't support OAUTH anyway - so my solution is to use Fastmail + 1Pa

Very often. I don't trust Google-FB-MS to be my main identity provider - and a lot of stuff don't support OAUTH anyway - so my solution is to use Fastmail + 1Password with their masked mail integration (it generates 1 random email for each login). According to 1Password I currently have 253 different logins.