I'll add ive also seen this happen pretty frequently in Discourse's community. but because every thing is open-source i think its pretty easy to mix and match community built plug ins with stuff maintained by the core team. From what i understand from hanging out on the forums over there - if a 3rd party plugin becomes super popular then i think thats a bit of an indicator to the team that its a big want/need for customers. I wouldn't be surprised if they reached out to original developers to see if they could work out something equitable. i dont know for sure but ive seen cases of people build really popular plugins and then later on end up being official employees of the company.
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I'll add ive also seen this happen pretty frequently in Discourse's community. but because every thing is open-source i think its pretty easy to mix and match community built plug ins with stuff maintained by the core team. From what i understand from hanging out on the forums over there - if a 3rd party plugin becomes super popular then i think thats a bit of an indicator to the team that its a big want/need for customers. I wouldn't be surprised if they reached out to original developers to see if they could work out something equitable. i dont know for sure but ive seen cases of people build really popular plugins and then later on end up being official employees of the company.