They're doing a terrible job of preventing scams. Right now there are hundreds of listings for GPUs at too-good-to-be-true prices from sellers with 0 feedback or, worse, from old accounts with positive feedback that have obviously been taken over by scammers (all the feedback is from years ago and about unrelated products). Trust is what eBay brings to the table, when they cede that to scammers, they stop being useful...I can get scammed on TikTok any time I want.
Is this really a big problem for buyers now? Asking genuinely, not rhetorically. In my experience with eBay (my account is 25 years old), the one thing you could count on is that buyers who receive nothing, or get a box of bricks, or broken items or whatever, basically 100% of the time, will get refunded - if necessary, by eBay itself. (This has been frustrating of course for honest sellers who get scammed by buyers.)
So, if they have a ton of scammers now, I would think customers are not being that impacted, and I would have also thought that eBay wouldn’t have too hard a time getting the sellers to pay the refunds, since they tend to withhold the funds from sellers until a little while after the delivery is confirmed.