Money I'll give you, but the vast majority of software is not going to be "interesting" or progressive. There are tons of major corporations doing "boring" work.

Money works perfectly fine as compensation for boring work :)

I'd add 0) don't have a shitty code base. Nothing hampers my productivity (and the businesses) like technical debt.

How does that help someone who has been there for 2,3,4,5 years, since they created that.

Much like raises, Devs can get strung along by promises to clean up or rewrite in the future, or often by their own thinking that they can slowly fix things (been down that road enough myself).

Also, it makes it possible to get to the point where you are retaining people for 2+ years. If there is a lot of turnover under that then it's probably the companies fault.

Well, it might help their job security (no one else knows how it runs).

There was a guy who tried that, he wrote code so bad that no one else could understand it. In the end, the company fired him and hired someone else to rewrite his code from scratch. It's not worth it, just write good code.