The new version of dpaste.com will let you create an account via GitLab, Bitbucket, GitHub or, Google.
You can also create a standalone username and password. Or use it anonymously.
The dpaste.com Mercurial repo has moved from BitBucket to a new software project platform, #sourcehut. It's in public alpha, but quite capable, and staunchly *not* trying to be a GitHub clone. Thanks Sourcehut! https://sourcehut.org/