There’s no reasonable expectation of there being trade secrets in the repl.it source code. Trade secrets are narrowly defined and there’s mountains of case law to shed light on the specifics. If they stole a super-secret algorithm not published anywhere else or stole a list of paying customers, now that would be a problem. But any handwavy non-specific speculation is so wild as to be FUD.

Create a competitor? Maybe you should give the article a read, mkay?