I made a swap on Cake Wallet yesterday, so in my LTC account, it says X LTC is deducted in exchange of Y XMR. But as I clicked on the track link, I was redirected to an exchange named exolix, where it says only (Y - 0.01865048) XMR is obtained. On the other hand, on the XMR account, Cake claims to have charged 0.00071232 XMR, which could only account for 3.2% of the send-receive gap.
So, did I just paid a $3 hidden fee to the wallet, the exchange, or some intermediate miner/validator? I fully understand privacy is not free, and the benefit of no KYC overweights the drawback of no customer service. Thing is, I believe transparency matters. I don't even know the extra cost results from a one-off commission, a spread in proportion to the trade amount, or a mix of both, and that's a real pain. In contrast, if one swaps USD for EUR on Revolut or Wise, he always gets what the app hints, if the order was placed quickly enough.