I use LDVbank.com for exchanging BTC and here is my experience
I use betterhash.com app for mining and it is legit. I use a 3070 card and its mining speed is almost 52 MH/s [ETH - Ethash (Phoenix)]. I am mining since March 1st this year. Till yesterday - May 15th (after 2 months and a half) I mined 0.006 bitcoins (after automatic exchanges of ETH). I used automatic BTC transfer (first after 0.001, second after 0.005 BTC) to my private infinity wallet and then directly to LDVBank.com wallet, when I found out that for each transfer I will pay around 10 euros. The fee for exchanging BTC to euros is 0 at LDVBank.com and for transfering to a Revolut euros account is 2 euros flat. So in total I pay fees of 0.0002 BTC flat and 2 euros for my mining plus energy cost which, in my case, is pretty low, around 0.15 euros/kW (around 20 euros/month, I guess, for 200 W/hour power consumption). Finally, after taxes, which are 10%, my monthly profit is a sum of 75 euros (today). My monthly mined BTC (after exchanging ETH) is around 0.003, so profit may vary depending of the BTC price. But I prefer to withdraw BTC from betterhash.com once to almost 2 months, when I have 0.005 BTC. You can choose to withdraw even more rarely, 0.01 or 0.1, to maximize your profit. Good luck to all!