So have you tested that the fingerprint remains the same regardless of the state of the OS (drivers, let's say)?
Or have you tested that the machines you rent, which are obviously the same, have the same fingerprint as the machines of consumers in the wild?
I understand you are seeing a low ban rate using Macs, but this observation is not a proof that you truly blend into the consumer crowd.
That's why I used the word "assumption". You definitely blend into the Mac cloud crowd, which can be dangerous in the long run.
BTW, in the article I mentioned, you can find out that there are actually ways to fingerprint different instances of the same GPU.