Rather than donate money to these MLMs, just donate blood

https://www.google.com/search?q=phlebotomy+gout

Nope. Although I am not against cupping, I regard it as inefficient due the relatively low level amount of blood involved and general wastage in the procedure, given the availability of blood donation services AND according to the trial therapy regimen described in one of the search result, blood testing for blood iron levels (not so much to prevent anaemia, but to reach the near-iron deficiency criteria).

If you are already under the care of a doctor who knows your diagnosis of gout, suggest a simplified blood donation schedule matched with blood testing for iron levels.