I believe it's been crickets because open-source/DIY solutions almost never become mainstream. Devs tend to think everyone wants a self-service to save a few bucks.

Most ordinary people don't care that much about privacy and if there is a solution that just works well enough to cover their needs and costs just fair enough to be affordable, they are going to use that. I feel like this is why fast food is such a thing. There are far better food options out there that either require a little bit more effort or money. Your post on Linkedin is akin to someone claiming in 1960's America that home-cooked burgers are the future, despite McDonalds gaining ground.

It is also why crypto wallets and the like never took off, people don't want to give up the convenience of a bank account, understandably.