I think eBay has a lot of what I would call "process debt". Not technical dept, I don't know what their code looks like. It's all that extra complexity that has built up over the years. eBay has so many menus and settings and listing options that I just get lost.
The most obvious one is PayPal. That may have made sense in the '90s, but today I should just pay money to eBay, they take their cut and send the rest to the seller. Instead I pay directly to the sellers PayPal account, which may be named something completely different from their eBay account. Then eBay sends the seller an invoice at the end of the month or something. All unnecessary complexity, but I'm sure someone would be outraged if they changed anything.
The most obvious one is PayPal. That may have made sense in the '90s, but today I should just pay money to eBay, they take their cut and send the rest to the seller. Instead I pay directly to the sellers PayPal account, which may be named something completely different from their eBay account. Then eBay sends the seller an invoice at the end of the month or something. All unnecessary complexity, but I'm sure someone would be outraged if they changed anything.