Ebay, amazon and other companies like them will never accept bitcoin. The main reason:
i wouldn't say never, and the reason you mentioned is not it. the only reason why they have not accepted bitcoin and probably won't for a long time is lack of interest. people are not so willing to spend their bitcoins because of the constant price rise everyone sees bitcoin as a pure investment these days.
1) There are a lot of scammers in the bitcoin sphere and we know that already.
there are scammers everywhere, saying there are a lot in bitcoin is not right.
The issue is that is someone is scammed on eBay, for ex, Tony buys a laptop from George. George gets the $ on paypal immediately, but never ships the laptop.
..or he ships the laptop and Tony does a charge back and gets his money back too. and now George has to go beg to Paypal that he was scammed and be patient as Paypal ignores his ass for as long as they want.
try searching how many people are being scammed with Paypal charge back every day.
After a week or 2, Tony makes a report on ebay, which then takes the $ in George's paypal account to give back to Tony, while also suspending George's account.
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I'm pretty sure sites as large as eBay and Amazon won't want to deal with the constant reports of "I didn't get this package and my bitcoins are stuck in escrow, can you help me?" etc etc that come with an escrow system, as well as the fear of getting hacked.
so you are saying these large businesses are OK with constant reports of Paypal charge back and scams but they are worried about reports about stuck bitcoin in escrow?!! that doesn't make any sense!