Not all though. It doesn't mean that all projects who are using Polygon, Solana or any other blockchain are legit either. I don't mind about the blockchain, coz' the legitimacy of the project and team is what matters to me most. Just saying.

If you want to check if a certain crypto project is a potential rug or not, you might wanna try Ruggy Buster which is on Telegram that can check and analyze smart contracts. I'm just suggesting to help.