Narrow pre-LLM models that spit out content and ad recommendations have never been capable of also suggesting, let alone implementing, self-improvements.

RSI has always being a well defined name, and you can only have RSI if you have an intelligence capable or creating itself.

It has technically existed for a long time (for longer than the name), but only on academical applications for extremely limited intelligences that could only create something like themselves. And that is still the only form that exists today.

It was never powerful enough to optimize ads distribution, and all the claims people are pushing around today are plain bullshit.

Clearly well-defined must live in a probability bracket. Only humans demand exactitude.