as zim said, everyone grew up LOL
but yeeeeeeeaaaaaahhhhhhh, this section was in its prime from 2013-2017, all the good actually experienced devs came along at one point, you know, people who could actually make a difference and educate others, not just provide a source, show how to setup, and leave it as that, these people were actually teaching others, you know, motivating everyone pretty much. But then they all slowly started quitting, as they probably grew up realizing that this isnt gonna pay bills.
as for what you said about the flash stuff, flash will always be available to use, its just not going to be supported for updates and fixes in the future, you are still going to be able to use it though lol which means that flash-based private servers will always exist forever and ever as long as you bother using it, its just that people want to follow prods route, thinking they can also be multi-millionaire game developers xdxdxd, but realize its not that easy when the time comes, which eventually leads to quitting like most of the other smarter devs realized at an earlier time hence their resignation loooool.