This is why many are also taking advantage of the telegram groups by displaying themselves and disguising as the admin's, there's no way to stop this but to give public awareness.
There are also scammers on twitter.
Just like by visiting those announcements from the developers, there are these like giveaways that are being held through that.
When there is some instructions that dictates to send you xx amount of eth or bitcoin to an address, that's an obvious scam.
There are many scammers like that and they are everywhere so the only thing we can do to protect ourselves is to not be so dumb, scammers are very smart somehow they are able to get the list of everyone that invested in an ico and then they send them malicious emails trying to get their private keys and unfortunately many people fall for it, so people need to familiarize themselves with the current scams so they can avoid it.
This is probably why the social media platforms have now chosen to ban ICO ads. Since there are many which are scams, their users may get victimized of these scams and their reputations will be at risk. These advertisements may help facilitate the scammers reach a bigger audience through social media. Awareness on how to avoid these scams should be spread so that the users may know what to look out for. There are red flags which help us tell whether an ICO is likely to be a scam.