Ask HN: Coinbase alternatives?

I have an account that I opened in 2013, with several BTC transactions per year. I am carrying a decent BTC balance there. My linked bank account has been the same. I tried to buy 2 ETC. The transaction got declined by Coinbase and my account got limited with no explanation: buys are restricted. Support chat is a chatbot, an attempt to email support is unanswered.

I think that with their initial success, they decided to play by Google AdSense playbook: treat honest customers statistically, but not individually. The problem with this approach that unlike AdSense it will be harder to build an monopoly here: it's a good time to start a competitor, focused on decent customer service, like Amazon.