Lol no, we just love to speculate, but if this is your mums node, she's got a lot of Bitcoin and is seriously over committing capital to capture not much routing fees

Most likely they will charge a high fee, their customers clearly don't mind, they want to custody with binance, and if you're skipping on-chain fees and you can bring that into your bottom line and your customer base doesn't know the difference, then why not?

I could see them even waiving deposit fees so they can get LN capital in but having a high withdraw fee to reduce capital going out, since they can make more rehypothecating funds in their platform than routing payments on LN