This is not an airdrop from Binance since there’s no way Binance will create an airdrop that requires tip from participants.
Recently, Binance already have the feed feature which any user can publish post such as this scam airdrop to lure people on participating with this scam airdrop. Binance feed is full of scam post which Binance doesn’t moderate.
Binance feed is like social media but of the post there is not reliable because scammer is using it to scam compared to the actual content creator sharing valuable post.
Yeah you must have seen that airdrop post in binance feed and not in the official binance page. You can find lots of such nonsense and scam things in such feed. Anyone so called influencers can create such posts. Don't fall into it. You can also find such things in twitter too. If binance conducts such event officially, they would do/send it directly into your binance account if you were eligible by holding funds there.