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It's just a rumor.
However, people are speculated everytime there has somethings like this you need to do (Swap & Bridge) token from Metamask. So, basically is just a guess and hoping from the community.
Another speculation from all community crypto, minimum swap or bridge at least up to 1,000$.
If the swap is that high then not everyone can participate in this airdrop, I just read this airdrop here in this thread why it's not
covered by big media outlets dedicated to Crypto it should be a big event or news in the community, but it turn out to be speculation I visited the bridge page of metamask, and it's under maintenance,theres been a lot of airdrop that turn out to be worthless this one hopefully will materialize because of the potential.