Just tried to sign up with Roam to give it a spin so I could compare it with Tiddlywiki. I couldn't sign up. It forces me to give my email to subscribe to their newsletter in order to sign up.

There is no visible way to get past that newsletter screen and if I do try to subscribe it actually redirects me through some tracking site that pihole (helpfully) blocks. What an absolutely terrible design and user-hostile experience. Shame on them. They lost one possible user for sure.