Because it exposes root and system internals. Biggest reason android devices get compromised/hacked and your fun, quirky android becomes a link in a bot net peddling god knows what including attacks against people and other illegal activities and media
See!!! I knew this shit was gonna happen. Check out my post from a while back - on chrome and edge, when you hover over the links, they resolve instead of showing you the top link.
This means they can setup infra and evade scanning to redirect probes to legit sites like retailers, bank homepages, etc.