Back when I did business on ebay they wanted access to my checking account data. I'd set up a separate account for my ebay stuff. I read a story about ebay freezing a business account over a dispute. Several months after doing a fair amount of buying and selling, with no issues, my banker told me, ebay requested, from my bank not me, info on both my business and personal accounts. I never told ebay about these accounts. The business account is a DBA. So, they snooped and didn't advise me of the request. If not for my banker asking my permission, i wouldn't have known. I refused.
Once paypal was running, i began using pay pal. Being a photographer, i often took for sale items into the studio for photos. ebay wanted access to my library of stock product images. I refused. Months later, ebay contacted me, wanting to send a representative to my place of work or home to observe my technique in putting an item up for auction. They offered me $100 in payment for the process. I told them my time was worth $1k/hr. If they were willing to pay that, we should talk. I heard nothing.
In my work, i was in a meeting where our client, a very big software co, hosted about 40 favored vendors for a new product preview. Among them were names like UPS, Fed-X Union Bank, Adobe, etc. Many were from SilValley. These were all business Execs. 3 presentations were made by Cos who had used the new software. I don't remember the first but, the second was ebay. The ebay people took the stage and they were booed by about 100+ people in the room. I couldn't believe it. These folks were all wearing $3000 suits and booing ebay like they were the bad guy in a phony TV wrestling match. Once the booing stopped, ebay gave their presentation.
I quit using ebay years back. They are far too snoopy for me.
pkr