I'm not sure what developers you mean. PayPal is a private for profit business that stand to lose more than most any other company as bitcoin expands. They offer the same utility as bitcoin except that it costs way more and can be trusted way less. PayPal not only has no interest in seeing bitcoin catch on, it hurts them. PayPal's developers are not going to work on this until they have no choice.

Bitcoin's developers work on a computer protocol that can be used by anyone who wants to use it. It could be a business or a just a person. It is up to the user (institutional or otherwise) to fit it into their business.

So far this has been difficult because many laws have been added to keep the "little man" out of the money. For example: many use cases for bitcoin require a money service licenses in each state. Some states charge millions of dollars for this. You may think that America is a capitalist system, but in fact often the markets are not free and are gamed by large banks.