I actually made a comment about this in the gambling section, because I asked why they accepted lightning for deposits but not withdrawals. They replied working on it but difficult.
I actually see their point. If you go to deposit and it fails you still have your BTC and you can try to figure out what is wrong.
If they try to send you BTC and it fails, they have to figure out what is wrong on their end, or your channel, etc. I have played at some casinos that have lightning deposit and withdraw and when the withdraw failed it was a real pain to figure out the issue. Turned out to be one of my channels but 1st thing I did was ask them what they were doing wrong.....
-Dave
For trivial amounts of money it's not a big deal if someone has to wait for everyone to figure out what is wrong, for larger amounts it is a big deal.
But.....
For trivial amounts it's not worth the time and effort to setup lightning for them. For larger amounts I could see it being a support nightmare.
How many posts here do you think we would see with people complaining that they were not getting 0.025
BTC funds from exchange XYZ while the exchange is trying to explain the largest channel they have open is .0245
BTC-Dave
It's getting more complicated with the balance flow of LN channel (e.g. current LN channel state allows Alice to send 0.01
to Alice), the website also need to specify maximum possible deposit/withdraw after LN channel is created and show guide/explain about it.