This entire thing was a great idea, poorly executed.
I tend to think it was a bad idea, executed as well as could be imagined, with a ton of resources and public awareness supporting it. The whole concept was let's get around all that bank bureaucracy and offset the added risk by shifting liability for bad loans to investors.
Then it was discovered by both the bank and the investors that the highly diversified and competitive banking system had evolved the costly processes it currently has because cutting all the bureaucracy out leads to... a bunch of bad, if not fraudulent loans.
P2P lending was just one of many themes which emerged in the reach-for-yield 20-teens. Each startup sought to use a web platform and some renaming of terms to get around existing norms, procedures, laws, and taxes. They promised to unlock HUGE value that was trapped in old fashioned institutions. Real estate investing platforms, Wework, art investing platforms, and "crypto banks" like FTX were other examples.
They should all be considered the illegitimate offspring of a timeshare and a ponzi scheme. If you managed to withdraw any money out of such a company, be grateful.
I'm still haunted by the posts in 2018-2021 by people on this board who were loaning bitcoin at 9% interest or doing online RE loans to failing developers at 15%. They were trying to recalculate their FIRE numbers based on this new and permanent income and it felt like watching somebody kill themselves.