I'm going to play devil's advocate here and say that maybe it's because LN-related deposits/withdrawals simply doesn't have that much demand as of yet.
But if you're a pioneer in the field of decentralization and a leader in the world of crypto and you aim for all those bla bla bla things CZ brags about it when he goes full peacock mode he should have at least tried, right? If not deposits at least offer withdrawals via LN, it would have been easier for Binance and it would have been enough for a test to see demand. And even if we talk volume and usage, if you still list 600+ rank coin that does under 1 million in wash trading and you still go through the effort of offering deposits and withdrawals for it, which at that volume I'm pretty sure are under 1
BTC a day you could offer LN also, and even if the numbers won't be spectacular for sure they would top at least one-quarter of those useless bitcoins traded there.
Also, the prosecution would like to ask the devil's advocate why are Segwit withdrawals more expensive than legacy ones?
At least one in that list is no more:
The Rock Trading Scam www.therocktrading.com Exchange Review They don't even call it WBTC (which is on ETH) or anything else, but straight BTC!
And they have two of them!
Binance has more than two, it has three.
I meant on their own chains, not including eth.