Bitcoin is a medium of payment for freelancers I mean basically I do the job and join in the signature campaign and get rewarded in Bitcoin as a payment.
This forum services usually pay their freelancer using bitcoin or other form of crypto even outside this forum there are a ton of app that pay their freelance in crypto as a whole.
Sometimes you as a freelancer, a signature campaign participant, has no choice in payment method, or can say you mainly have no choice. The company and campaign manager, discuss and decide the payment method.
Some will feel happy by receiving bitcoin in payment and consider it as indirect DCA in Bitcoin, as a type of investment. Some will feel not happy because they don't want to see fluctuation or big change in value of payment in some minutes or hours or some days. Some will have to pay expensive on chain transaction fee, sometimes, to exchanges for selling.
But if we are talking about working in signature campaigns, it's not surprising that most companies here prefer bitcoin over other crypto, except when the network is congested which makes transaction fees for bitcoin highly expensive. Nevertheless, bitcoin is a great payment when it comes to freelancing jobs.
It can be explained that most of companies have service threads in this forum, accept Bitcoin as one of payment methods on their platforms. It means they don't have to purchase bitcoin and use it for payment to their staffs, signature campaign participants. They simply assign part of their business income to pay staffs and participants.