But...How?

From an exchange position, the followings are pretty common (no mixing like TORN on Ethereum, but going from ETH to Monero and back for example): 

• changenow.io
• tradeogre.com/markets

I've seen many went from ETH to renBTC, thereafter use coinjoin and bridge back to ETH… Or just: (Dex-Torn-Dex)x2…

• I can also recommend using a sponsored transaction: officercia.mirror.xyz/U4Q90DtLU-6A_Kfd6JWYrt2nMHohmSt_z56FWFHKyHI as well as cross-chain swaps.

Thank you!