Probably because they don't want to use Bitcoin. It's not too hard to consider when you think about the volatility and the relatively small quantity of individuals who use Bitcoin in most capacities. It's a lot more common to see people using literally anything else they're currently accepting as payment, and Bitcoin is still a niche thing that a lot of people are wary about due to the crash we had a month and some ago. I don't know how quickly the trust is going to return and how fast companies will decide to adopt Bitcoin, if ever.