I, personally, use old and/or shitty equipment and techniques when I do woodworking, for example, like using chisels to make mortise and tenons rather than a fancy plunge router, or just skipping those and using one of those fancy Festool machines that do the "fancy biscuits".

When I program, I mostly use Python these days (don't judge me!) and I tend not to use third party extensions or libraries, so I guess you could say I use the "old school" technique of using the standard library for Python for everything, where if I were trying to make money I would be using `poetry add` for things like requests, flask, etc.

I think irrelevant and out of date tech can be used for making money, but it's a bit harder that way. I personally like using the "old ways" quite often in my personal and professional lives, and not trying to optimize my personal or professional life as much as most do, but I can see that I'm not the norm there, and most people just memory-hole old tech and move on to the next house of cards.