I have become resigned to the fact that no matter how hard you try to prove otherwise, eBay and PayPal are going to side on behalf of buyers, time and again. As someone who sells a decent amount each year on eBay, I probably encounter one buyer each year who claims a refund on the grounds of not reading a listing carefully and there essentially zero hesitation on the part of the platform to issue a refund to the buyer.
This is frustrating, but it's the result of a system whereby bad sellers screwed over enough customers that the pendulum swung back the other way, and created an opportunity for unscrupulous buyers to scam decent vendors. The pendulum, thus far, has not returned to the middle, so the emphasis on preserving buyer trust remains high.
Recently, I incurred a fair amount of stress asking my brother-in-law to receive a set of wheels from a Facebook Marketplace seller in Virginia. This was due to the proximity between my sibling-in-law and the seller, and because I couldn't sneak away to meet him. For an additional $50, he agreed to drive the hour to their house and drop off the wheels (which were an exceedingly rare set of Zauber AMG replicas in a great staggered setup.)
After incurring the wrath of my wife who diverted her travel by 20 minutes to grab them while she was having lunch with my sister-in-law, I yanked them out of the box only to find the seller a.) doesn't know how to measure or b.) was a total liar and scam artist. They were not the 17x8 and 17x9 as advertised, but rather 16x7 and 16x8, which wouldn't even begin to fit on my 1992 500E. Fortunately for me, he specifically requested PayPal for payment, and I opted to send it for goods and services, paying the additional fee in the process. The seller, of course, went dark once I mentioned he was a total dumbass and needed a lesson in remedial measuring, but to PayPal's credit, they got the seller to agree to a refund. I shipped the wheels back to him (at my cost, of course - so that money is lost) but I was so enraged looking at these things and knowing how many favors were exchanged just to get them home.
PayPal isn't perfect, but when you as the buyer opt to pay for the security of buyer protection, there is a bit of a covenant struck whereby the service has to at least try to understand why you're unhappy. I fortunately had several screenshots of the seller confirming he knew how to measure and could tell his ass from his elbows, so all told, I was fairly well covered from his ineptness.
Unless the seller is your best pal, it's far cheaper to pay the necessary fees and stop jokers like the one I encountered from ruining your day,