I recommend AGAINST this service with all my might.

In fact, I've never seen a mixer built in a worse manner than YoMix. I'm confident that the only reason they spend so much in signature campaigns is because they want to launder their own dirty and crime-tainted coins by bringing in foreign volumes.

Why is their service bad though? They fail at the most basic thing in bitcoin and this proves they have zero idea at what they're doing. Nearly all transactions passing through YoMix add sub-standard fees, this first of all this makes YoMix transactions very easy to identify as their transaction fee pattern is very noticable on the blockchain, and it also makes their transactions highly likely to get stuck, potentially for a very long time.

I have a transaction stuck with them for two days, nearly at the last positions of preference of mempools on most miner nodes. I kindly sent them a support ticket to ask for either a doublespend so they could increase the fee and have my transaction actually arrive, but they outright refused saying their platform isn't built for that.

Motherfucker what do you even mean your platform isn't built for that. My BTC passes through your addesses that YOU own the private keys to, and with hefty 0.7% fees just for a transaction you cheap out on transaction fees that are even deducted out of my own balance!? I gave you my coins to mix them, not to have them stuck in limbo forever. And what happens if the transaction is dropped? Are you still not able to recover my coins for me then?!

If you don't know how bitcoin works don't even start such a service.