well, uploaded.net used to accept bitcoin. but they did a poor job, as in not updating prices(to a point where they assumed $15/BTC when 1 BTC was at $3), and accepting 0-conf transactions. I think most other filehosts just dont "know" how to implement that.

However, you can still buy your accounts on bitmit. I usually buy from epaysolutions(https://www.bitmit.net/en/item/27616-uploaded-net-30-days-premium-account#), the guy isnt always the fastest, but he delivers, and you save a couple bucks, plus you stay anonmyous. Also, the guy has most accounts that you could need in stock.

Edit: there also used to be a guy running a site called bit-host which delivered instantly after 1 confirmation, however the guy ran at some point. dunno really what happened, but I liked his shop until he got like 0.6 BTC from me and didnt deliver...