People don't generally go to one of the review sites, such as Trustpilot, if they've bought or sold something and it went through without a hitch, they tend to go there with an issue, thus any stats will not be worth taking into consideration, they'll be extremely skewed.
Years ago I did take a cross section of negative reviews from Trustpilot and another site and looked at each complaint in some detail, and nearly each issue was due to a fault on the part of the reviewer. For example, the most common being that they'd sent out something without a tracking number and had to refund, or the buyer messaged them and asked them to ship to a different address (lots of scammers trying this at one point and sellers falling for it), deposits paid for non existent vehicles (tractors were very popular for this scam at the time I was checking), buyers realising that the one year warranty offered by a seller was only ever going to be as good as their ability to enforce it when required.
From what I recall the outcome was 97% user end error, there were very few low reviews in which eBay was actually at fault.
I later did the same for issues being reported and discussed on Reddit. Same outcome.
It's a human failing, people find it almost impossible to hold their hand up and say "I goofed, I didn't read up on how the selling platform worked", instead they must find somebody or something to blame.
Quite interesting, really. It's like when people fall for the romance scam and send tens of thousands of pounds to a complete stranger who's sent them a photo of Brad Pitt. They all blame the banks for letting them do it, even though the banks flag up money transfers to a stranger and ask you to read and accept the 'this could be a scam' document before allowing you to go ahead. But it's the big companies fault, not theirs. 😀
So, to answer the original question - do eBay care? - no, the stats are completely insignificant.
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