Similar worlds probably has all your personal information stored on a file

And?

I see no issue.

https://similarworlds.com/100-Admin-Announcements/1978998-Hello-Similar-Worlds-The-SW-Team-is-pleased-to

They can probably see everything you post

Is that good or bad?

Already been sold

Which is what lol

All they get access to is your email, IP address and your device information.