It hasn't caught on here much and not many freelance employers offer payment in Bitcoin anyway. Most of the time it's Paypal, which you can't even access online in Cambodia. I have to have my dad log on to my Paypal account from the US, transfer the money to my US bank account, then either bite the bullet on the international ATM fees or do a wire transfer to my bank account here. The fees add up as you can imagine, especially if you find freelance work through some place like Upwork, who then take their own massive cut. It would be amazing if cryptocurrencies caught on, many hundreds of millions of people would benefit greatly from that. It would also be amazing if I had not spent the 400 or so Bitcoin that were once in my possession ;)
There are websites like Upwork which only work with cryptocurrencies.
For the existing employers, you could offer your employers a discount on your rate if they use bitcoin (or rather, ask them for a surplus percentage if they don't ;) ).
Did you try bitcoin?