Re: 1,500 restaurants in France start accepting bitcoin payments through Just Eat!!!
My question is; Which is better practice to promote adoption of Bitcoin by merchants and outlets?
Accepting it as a payment method, but not holding it.
Holding it as a reserve currency, but not accepting it as payment.
Holding BTC as a reserve currency in an already risky environment (which is a standing up business) is risky as hell. In the end, we pay our everyday stuff and receive our salaries in USD value - not in BTC. Having your income go crazy from not even a month-by-month but a daily basis is probably as risky for a business owner as holding a shitcoin is. Accepting it as a payment method, but not holding it.
Holding it as a reserve currency, but not accepting it as payment.
The fact that the owner of the restaurant you have linked turned their money into BTC doesn't mean anything else but the fact that he is a Bitcoin believer and investor. While I understand it'd be better if we were purists and had no payment processors, that is just from our view. Let's not look past the consequences Bitcoin could suffer from if businesses adopting it the "purist" way started struggling.
The fact that "cancelled" transactions are refunded in Euro is a clear indication of what their main goal is with Crypto currencies. 
It doesn't look like a bad intention to me. They're accepting Bitcoin. A business will obviously have mostly one main goal, and that is earning a profit. This is just one more choice for our French BTC fellas. 