I have started doing the same. For a few cents on Deepseek you get full reverse engineering of apps, firmware, can patch whatever and essentially build anything that works for yourself. Leftovers can be done with local LLMs for free.
Many apps/products can be freed and owners can take ownership of what's theirs. It doesn't even need to be a community effort as you can make something fully tailored. It also frees you from gated app stores as distribution channels, and all the unnecessary tracking.
It will take years for many nasty apps/companies to catch up, so nerds should enjoy this new superpower.