Bittrex is not a bad exchange for me in terms of their service.

However, most of exchanges ask for a selfie of yours along with the photo ID to ensure that the photo ID is not a stolen one. This is doing for your own safety because if someone else who stole your photo of photo ID can pretend as you and do illegal activities which is known as identity theft.

Exchanges have to comply with the rules and regulations and they asked to take necessary measures to identify their customers. Therefore, we have to do it and pass the KYC verification though we don't like it.