Sublime is not open source and it has a very devout paying client base.
To me the dirty thing is to make something “open source” because developers absolutely love that, to then take an arguably “not open source” path of $42 mil in VC funding.
There’s something dissonant there.
Open source allows it to gain adoption in the dev community. Devs are notoriously hard to convince to adopt a new tool. Open source is one way to do it.
The path is usually to have an open community edition and then a cloud/enterprise edition. Over time, there will be greater and greater separation between the open source one and the paid ones. Eventually, the company will forget that the open source part even exists and slowly phase it out.