Peanut gallery, in my experience. The number of people who I've never met before who decide to complain about hardcoded file paths or run a linter and tell me my paper must therefore be garbage is frustratingly high.

This seems to depend on a paper getting a modest amount of media traction. That seems to set off the group of people who want to complain about code online.

peanut gallery are likely to give stupid feedback. Academics are likely to ask for help using my code -- which is nice but doesn't (usually) contribute anything useful to me, and takes up time I could be spending on other things.