To add a few more details: After trying several times with different IPs and different browsers, I was able to register by providing only a mobile phone number once. Since that still requires personal information, this is still a very questionable process. (not to mention it took me a day to not be asked for a cred card)

That post is only in regards to the CI feature. But today, even basic registration requires personal identification. You cannot even report bugs on open source projects without

Even Github does not require any personal information, so there are certainly other ways.

Try lf then. You can configure it to work just like ranger (see project wiki)