Very good idea. For every company that is valuable because of software + knowledge + service + loyal customers there are a dozen that only exist because of weak competition and inertia.
Easy to imagine there are a lot of software products that could be cloned and out-competed by taking 15% profit margin instead of 50%.
So a dedicated team of engineers creates a functional product, and you plagiarize it so you can have all the profit for yourself?
Only a "good idea" if you're a thief with no original ideas.