Are you holding any BNB on Binance? That's how they chose the accounts for the airdrop. I had very little, maybe $10 worth, but that apparently was enough to break top 500k!
I wish Binance had a sweep feature, so that all those little fragments of coins could be consolidated and put to use. Some exchanges do that, though I can't recall which just now.
A very small amount but it seems I wasnt in the top 500k :(
I too have little fragments of BTC and ETH in Binance, its annoying is'nt it?