But that doesn't sound like an airdrop, based on your description it seems like you made an investment (or rather made a bet) and made a profit on your capital not on free coins that you got for free without doing anything or risking anything which is the definition of an airdrop.
In that case you could have made similar 5x returns on a lot of other altcoins that get pumped like that from time to time.
They are gradually trying to shift the airdrop definition from what it used to be. Airdrop is gifts given to people who actually do nothing rather than making provision for their receiving address, now are days they have started shifting them into staking and earning, which is more like an investment in my own opinion, very soon Binance launchpad reward will also be rated and consider to be an airdrop program, they should look for another term and label it if they are not comfortable calling it invest and earn, the word "Airdrop" typically own for freebies