Ohhh! I must look into that to see if I can sell less than 1 token for USDT. I hadn't even tried that!
But I don't think Binance has an USDT market for every coin, just a handful ? So this might work for some coins but not others.

I admit my frustration is only partly due to the money lost on dust too... It is some kind of minor OCD where I want a clean wallet to show up!
If they offered a 'trash' option, which would let you throw away your coins (donate to charity), I would use this to get rid of them probably. But I'd rather they just open up micro-transactions on the BNB market so you can sell all of your dust for BNB (which you can then easily turn into something else eventually).