Yes, in a classical airdrop model all the transaction are being carried by the sender. And the more massive the airdrop is - the larger are risks, that the token will be perceived by the system as spam. We have already described, why we are going away from it, in our article:
https://bountyhunters.io/blog/26That's bullshit. Perceived as spam by the system ? Is that a new thing ? Did you just come up with it ?
You send the tokens via the ETH blockchain... we receive them...that's it.
Any other system is either at the disadvantage of the user or just pure scam.
Either change your ways and go with a regular system or see your business tank.
I'm sick'n tired of all those bounty scams.