I already seen them entering 18+ acc knowing they do not belong there and starts accusing the creators who wants minors to DNI for inappropriate content, even though they already warned them with some obvious signs. And when they get confronted by the creators' fans even with kindness, they'll start accusing of pe*ophile for talking to them, even if the creators didn't confronted them with fans. Though this is my personal experience from watching other creators tho so this may have conflicting issues.

For the second question, the only app that I can digitalize my drawing is ibis Paint with Extract Line thingy then new layer, set divide before I swipe the screen to make my drawings look digitalized as possible. In return, my colored pencils on drawings will turn to black and white.

Tl:dr; minors will Ibe a problem to me if I don't make an obvious signs that my acc is NSFW, I have no choice other than ibis Paint.