Because the BSC network has a lot of fraud going on, so many people focus on it, although I agree that it's not just about one network but all of them that have indications of fraudulent projects.
One of the many indicators that must be paid attention to is that you are right in your words to monitor who is behind them, not just through social media. Even though it is not something that is easy to analyze, hopefully there is an intention to anticipate it so that it can be avoided.
There are scams on all existing blockchains, not just BSC. The reason (or one of the reasons) why the number of scams may be higher on BSC is due to its popularity. Ethereum's high fees were the starting point towards a "migration" of projects (and users) towards BSC, where fees are cheap, taking advantage of this popularity, scammers launched many scams, and unfortunately it is something that happens every day. The “solution” is the same regardless of which blockchain is used, contrast data, look for different sources... And even doing all that, there will always be some chance (although the risk will be lower) of being scammed.