Yeah those type of stupid invites that I did not even ask nor agree for. I never got a Telegram invite though, but still it does not matter since there were projects or even just a "non-existent" projects that just wants to steal my wallet by baiting me.
Airdrops were just like early crypto days if it would look like. I never experienced a legitimate airdrop ever and I have not even heard anything from the devs of the projects I joined, so I guess it is just mostly selling your email to them to whatever they are intending to use it for.