PI surely is a scam. They are scamming people in different times in different level. They had announced exchange listing a few years back and even listed a fake PI token with fake trading at a high price. I looked for ways of withdrawing the coin at that time but they had none.
Do you have any concrete evidence or are you just making baseless accusations? I don't own PI and I'm not defending them but if we want to accuse someone of being a scammer we must have solid evidence, don't just hate them and make baseless accusations. As far as I know, there have been some exchanges that automatically listed PI tokens on their platforms before, but the PI team also denied this information and they said that it is not the official PI token.
It's a good time to sell it if you are able to withdraw it to the exchange.
If you are not a financial expert or advisor, you should not give indiscriminate advice, especially on matters in which you have no experience. PI is currently trading at $2.7, if someone took your advice and sold them 2 days ago, they must be regretting it for losing a significant amount of profit
.