Seems fundamentally like a free rider problem. Here are some solutions. My money's on the second (software dev has great ROI) and last (Bitcoin operates on social contract) options working for Bitcoin. One is also interesting; imagine El Salvador funding devs as part of treasury operations.

As we mentioned earlier, the government can provide public goods that are susceptible to free riding instead of private firms.

Non-profits and other charitable organizations can also provide public goods, so long as there are enough funds to make the good or service available.

Companies can find ways to mitigate the free rider problem by making changes to their product. For example, a subway turnstile discourages most people from sneaking on to the subway and riding for free. If Wikipedia wished to do so, they could add a paywall to make their service excludable or they could seek revenues elsewhere by placing paid advertisements on their site.

Certain market interventions might also help to discourage free riding. For example, consumers of a non-excludable good or service could be required to sign a contract enforceable by law that obligates them to pay for what they consume. The government could also tax or subsidize goods or services in a way that ensures that sellers have an incentive to continue their products or in a way that ensures that consumers pay for what they consume.

Sometimes altruism, social norms, and social pressures are the best remedy for the free rider problem. If people are altruistic, they look beyond their immediate self-interest and derive pleasure from doing things for others. Social norms and social pressures work similarly. You would be less likely to free ride in a team project if your team members were your close friends or if you were afraid of being shunned or scorned by them as a result of your actions.

Public campaigns, such as campaigns to get out the vote and to keep neighborhoods clean, can often discourage free riding because they give people a sense of pride or social responsibility beyond what is in their limited self-interest. If social preferences and obligations motivate individuals beyond their narrow self-interest, they will often resist free riding even when there is an opportunity to do so.

Source: https://articles.outlier.org/free-rider-problem#section-5-free-rider-problem-solutions