No,we have used erc-20 address for the bounty
The Ethereum blockchain is the most popular blockchain and all bounty and airdprop participants have wallets in Ethereum.
I agree that the Ethereum blockchain is the most popular, but the commissions in the Ethereum blockchain are the highest, especially when tokens are moving.
Almost everyone has a wallet in Ethereum, so Ethereum is used for bounties and airdrops. The more popular the blockchain is, the higher the commissions in it.