Thanks for your valuable feedback. This indeed answers a question such us "What community is used to hear what you have to say?".

It is not really based on your interests, it just takes your text and suggests subreddits where people have posted similar texts.

Otherwise, I agree on what you say. I would love to also see those kind of systems. Kind of what you get as a reaction when you talk with a mentor that surprises you ;)

Unfortunately, my skills are not there yet but I am working hard to eventually be able to build those "surprise/discovery" systems.