... skipping the fallacies ...
The lending platforms should work properly if the people running them know what they are doing and I still think they are a good model as they generate profits for the company with the lending so are not real ponzis
Generating profit for scammers doesn't mean it's not a ponzi. In fact the whole reason for the scammers to take the risk to run such illegal scheme would be to generate a profit.
These are not "lending platforms". The borrowed funds are not used for any other purpose other than to perpetuate the scam, which ends when there aren't enough suckers bringing in new money.