I'm currently unemployed and getting a job is turning out to be really tough.

So I was wondering if it's a viable strategy to build a complete product, end-to-end and put it out on the market for someone else to purchase and operationalize.

I think "side-project" is misleading. What I really meant was "quickly buildable" projects. Some examples of such projects would include a unique LLM-powered content generator, or an AI-based Google Forms, etc

remove.bg is a good example of a project in the lines of what I have in mind.