Make sense, you might be seeing a real trend, but maybe not. You can evaluate things from personal experience, and even a small amount of negative individual experience can hurt a business, because of word of mouth. You should also calibrate your experiences once in a while though. A restaurant you had a bad experience at when you went might still be the best restaurant in town.

If fraud was a huge part of their business, they'd kill the 3rd party sellers from their platform, but I doubt it is. I think it's a net positive as a whole, but a small number of customers hate it. What they need to do now is improve those quirks you mentioned. That's much more reasonable then killing the whole marketplace.