Did they actually do any investigating here? Reading the letter it sounds like they are just reminding companies that could be fined, not that any of them have actually done anything
A lot of them allow customers to write reviews that the platforms may or may not have reason to know are fake. But good reviews are to the benefit of their bottom line so they might be incentivized to look the other way even if they have reason to believe they’re not genuine — Amazon, Apple, and Airbnb for example. It’s pretty common knowledge the reviews on those sites are frequently gamed. Any “platform” service that allows user reviews where the platform get’s a cut of the sale or where a part of their payment is contingent on a sale occurring is reasonable to include on the list I think.
I was pretty surprised to see a PE firm on the list, though.