talks about pumping a particular crypto
Yes, this is a risk, especially in the case of coins with low cap, maybe low liquidity too.
It's something the regulators have to address, because indeed, it's not right. But, historically, I think that the stocks too had this kind of problems many many years ago.
However, doesn't this belong to
altcoins?
Bitcoin should be much safer against this kind of attacks. Not 100%, but still, I expect one such group needs really big funds to pull this on bitcoin with money alone. However, you'll learn that pump and dump schemes can these days also involve a great amount of social engineering (from FUD to posts even like your very own!) and inside jobs too (wash trading), but that's no longer gray area, it's plain illegal.