What I would like to know if there are any recommended companies or services that do the same? - I would purchase a rig, maybe starting at the lowest price, link it to my OKX account, wait a month or so for the earnings to go up, transfer the earnings to OKX and then sell them.
You are better off purchasing the real Bitcoins and HODL. You are most likely going to make way more returns than even promised by the so-called could mining platforms.
Chances are so high that you are going to be scammed.