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There are at least 18 exchanges supporting Bitcoin to dollar conversion that are not Coinbase: https://data.bitcoinity.org/markets/exchanges/USD/30d

There are also other options such as various OTC trading desks or Gemini's daily auctions. And finally, there are several other full-service payment processors that they could try besides Coinbase.

Coinbase was a really bad pick for them. It's almost certainly the single least likely option to be able to support fringe businesses, due to their close relationship with banks and credit card companies.