Using Spreedy to act as a 'white' proxy to their API would make it an even harder job for Stripe to detect the fraudsters. What would be your solution to the problem?
If you strip away the "buyer's" IP then a lot of their ability to detect fraudulent transactions goes away. They still have account based limits and other methods, but my personal opinion is the anecdotal increase in difficulty of creating fraudulent Stripe accounts is due to Radar based detection.