Why do some telegram airdrops ask for Ton before claiming?

[BazinyAmg]

Some telegram airdrops are more concerned about how much ton they can get from their community, than the project itself asking community to pay before claim is something else, after days of intense mining. What could be their reasons?

[ABCbits]

I've seen people calling such airdrop as paid airdrop. Team behind it usually claim it's to prevent cheater and bot. But i don't like this kind of airdrop since,
1. If amount of demanded TON is too low, it won't stop dedicated cheater and well-programmed bots.
2. If amount of demanded TON is too high, people will perceive it as attempt to trading their TON with token that could be worthless.

[hugeblack]

The entire industry is built on promises of making you rich or making a quick buck for your effort/coins/$/DOCs/tasks/promotions or whatever they can do to get paid for you while paying you worthless tokens.