I don't think there is nothing wrong per se in selling L-BTC through their app. The main issue with Bitcoin.com is that they intentionally try (or at least tried) to mislead newbies in thinking Bitcoin Cash (BCH) is Bitcoin.

It seems like they changed a few things for the better, but when people overly criticised Bitcoin.com, they not only had Bitcoin Cash as the first thing you would see and select when buying coins (or using the wallet), but they also had it named Bitcoin (BCH) and Bitcoin Core (BTC).

That doesn't seem to be the case with Blockstream's Aqua and L2 solutions are needed, so what's wrong with it?