not all freelancers will use bitcoin as a means of payment, and they have to make an agreement first so that there are no parties who don't like using bitcoin as their wages, but currently bitcoin is familiar to all people and they already know how much bitcoin is worth Nowadays and on average they are definitely tempted by bitcoin, so for freelance work I am sure I will accept payment using bitcoin.
Indeed, an agreement must be reached between the two collaborating parties to determine how payments will be made. Bitcoin or PayPal is actually an attractive alternative for business people, especially those who work online.
maybe not only those who work as freelancers offer their services. those who have a real business offering goods or services can also accept payments in Bitcoin as long as the deal is attractive to both parties.
I once reached an agreement with a computer repair service. fortunately, they are also interested in Bitcoin and even have a local exchange account. we agreed on a price and payment was made in Bitcoin.
I'm sure there is no problem with freelancing with Bitcoin. but usually, the party who pays already has their terms and conditions with which they will pay their freelance workers.