Well, I use it from time to time with zero fees, so I didn't thought that, but I get the point
Discussion
Yes exactly. The fees are low until they aren't. They do the submarine swaps behind the scenes and you get dinged for them later. You can argue it it the price of convenience, but it isn't very transparent and I don't like that.
The other thing is they have a proprietary backup which is highly annoying. Why not just BIP-39?