I feel like loading sideloaded applications it's locked enough, google created google protect (which I have disable) but it if you have it enabled you are unable to instal sideloaded apps, also you have to accept the prompt to accept the app you're installing from and the prompt from your android to let you install sideloaded apps, like how many prompts is enough? now also a fee and verification. Most of the apps I enjoy the most are in alternatives stores. Ankidroid,keeepassxc,revanced, newpipe,tubular.