"I mean, these things were on github already, and still got reimplemented over and over again."

And now people seem to automate reimplementations by paying some corporation for shoving previous reimplementations into a weird database.

As both a professional and hobbyist I've taken a lot from public git repos. If there are no relevant examples in the project I'm in I'll sniff out some public ones and crib what I need from those, usually not by copying but rather 'transpiling' because it is likely I'll be looking at Python or Golang or whatever and that's not what I've been payed to use. Typically there are also adaptations to the current environment that are needed, like particular patterns in naming, use of local libraries or modules and so on.

I don't really feel that it has made it hard for me to do because I've used a variety of tools to achieve it rather than some SaaS chat shell automation.