Unpopular opinion, IAAL and frankly Replit has a case that will pass the "motion to dismiss" stage when litigation starts getting expensive b/c of discovery. The OP worked for Replit and therefore had access to private source code or "trade secrets" before creating his project. It'd take expert testimony for the OP to prove in court that his OSS project was not influenced in any way by Replit's closed-source code, which imo is unlikely.