This is unfortunately part of migrating. Not all communities can just move over. Larger ones will develop and with that side communities will start with a large enough user base. Reposting in this case still doesn’t do anything other than give you the exact same content as Reddit just now it’s without an interactive user base.
This is to be expected though. When a product is massively successful, a lot of companies will rip it off and create knock offs to generate some income. I’d love to see competition from some real competitors though. For now, the steam deck is unmatched