Excluding the Byteball airdrop on Steem from 2 years ago, I believe this is the first airdrop I participated.
I missed their first airdrop as I thought they would require KYC like any exchange before one can use their account fully but thankfully they did another airdrop to HIVE users this week.
As to how much... well:
From depositing 1037 HIVE, I got ~113.216 IONSX or around $2.44 USD which is currently locked up for 7 days (hence the "L" at the end of the token name I presume).
If my understanding is correct, IONSX is a sharenode asset that yields "daily payouts" taken from ionomy's pool of dedicated masternodes (or so what here says: https://ionomy.com/en/assets). The point is that by simply holding some IONSX, they would give you some IONS token daily.
As my 113.21 IONSX is still locked up I don't really know by how much I would get daily, but it seems it's not too much after reading this:
Source: @themarkymark/ionomy-does-another-exclusive-hive-airdrop-this-friday