It's a good question. I've always wondered that myself. Fiverr for example used to accept Bitcoin, but then stopped. I think there are two major problems with accepting crypto 1) crypto accounting in USA and taxation is not very friendly if you are acting as an escrow, seeing how it's mostly trated as commodity (BTW we have a dedicated category for cryptocurrency accepting accountants)  2) the number of customers willing to actually use cryptocurrency is really low, that's why you need a place which concentrates solely on those buyers, like FreelanceForCoins.com