Observed lately that not many crypto projects announce themselves on bitcointalk these days. Currently successful projects like Ethereum, MANA, AAVE (back then ETHLEND), NEM have anns here, but as years passed we see projects stopped bothering with bitcointalk.
If these are the projects you mention, then there is no harm to the forum, considering the reputation of most of these
"crypto projects" which mostly only contribute to the fact that the average person gets a very distorted image of Bitcoin. In fact, the less they are promoted here, the better for the forum's reputation and even better for all those desperate people who serve as cheap (or even free) labor in their bounty campaigns.
What do you think is the reason? Has bitcointalk lost it's charm?
If you have a legitimate project that you want to advertise and promote, then this is definitely not the case. However, I think that forums as such are increasingly losing their charm, considering that new generations want something else like FB, Telegram and similar things. But in the end, as I already said, it is not a bad thing for the forum.