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Scammers and getting scammed is an unfortunate part of capitalism. If all investments were enforced as 100% safe, there would be none on offer. It's always a risk, and judging the risk vs the potential reward is your responsibility and yours alone. I didn't buy any scammy ICO's, because I invested in the knowledge that led me to deduce that they are mostly scams.
You can't call those users who sold BSV at that time period as scammers. After the hard-fork happened, everyone who had previously owned Bitcoin received an equivalent amount of BSV in their wallets. In my case also, I received the coins in my Blockchain.com wallet. I wasn't sure about what to do with those coins. But when Blockchain.com announced that they are ending support for BSV, I had no choice other than selling those coins at whatever prices I could manage.