I saw the website and found it very mobile-friendly, so I will give this a shot. I am unclear about this airdrop thing, so I would like some light to be shed on it.
Do I need to be a part of housebets before the snapshot was taken to receive an airdrop of season 1?
Or if I have gambled only on a different website (for example sportsbet because I play there regularly), am I eligible for the airdrop? I am unclear about how did you take the snapshot without knowing that I'm gambling on that website?
The answer to your question is the number one criterion for receiving the airdrop. Having an activity to Housebets.io prior to the snapshot is their first requirement in able for your wallet to be tracked down. Housebets.io is a web3 casino which probably will track the wallet that you connect to their casino for a potential transfer of balance to eligible casinos. This is the typical method used by web3 casino with their airdrop to attract customers that is playing with other casino so that they might be considered as a second choice.
Housebets.io activity
You don't need to have any activity with Housebets to be eligible! Just need to have deposited in a way we can track your wallet, rather than a deposit from e.g. Binance.