Just adding my opinion to the pile that blanket removal of all reviews is really unfriendly to the marketplace sellers like myself who have spent years never engaging in any kind of review manipulation. It feels like we’re being very severely punished for others lack of ethics. My own product Ultra Dynamic Sky had 8 years of honest positive reviews, which I feel was a big part of why new customers trusted the product. Starting from absolute zero is not something I feel I should have to do.
At the very least, products with significant numbers of reviews should be subject to a simple spot check. If reviews are being manipulated (which is very easy to see), they can be removed. If they aren’t, they should be ported to the new review system.