Well, besides that, we also have to be careful with transactions between wallets, because they also usually apply rules where if there is a transaction between wallets, the participant will be disqualified because it is considered cheating.
This is a very basic thing for airdrop hunters that they should actually know. Because we cannot deny that some participants do have multiple accounts.
I have a main wallet to farm airdrops, it's the main one because I have the passport score, a good onchain print, transactions on mainnet eth etc, but I have secondary wallets to farm some new stuff that have some risk
But I always use exchanges to avoid being flagged as a sybil, but to be honest it's hard to being flagged with 2 or 3 wallets, some airdrops like Linea, consider 20 or more wallets as a sybil