yes, what you said is true. most airdrops now only collect participant data or perhaps to add to their Twitter and telegram followers.
after the airdrop campaign ended their names and accounts changed and that often happened
They only increase the number of their supporters then use it for their personal benefit,
We have encountered a lot of the said situation, and yes they often change the group/account name to make it looks like its real in the eyes of their new victims. That's why we better avoid those kinds of airdrops because they only think of themselves and do not care about their participants.