Be careful with lightning on Cake, it's brand new and there could be some bugs.
As for swapping feature they used various different exchanges, but in latest release they split them into Decentralized Only and Best Rate (Mixed).
Word of warning about this, I think I heard Near Intents can freeze coins, even if they claim to be decentralized, so be careful with this.
I would stay away from swap feature, and there are better rates on other exchanges directly.
Of course, I see no point in storing big amounts on lightning. I usually have less than $20 just because sometimes I need to buy something here or there, and LN is actually pretty convenient with the basically zero fees.
I wouldn't use any wallet swap function either. We have some good swap options on the forum (b1exch, sageswap, cce...).
