Heavy sexualization in ads (for an app targetted 13-17 demographic, not to mention the amount of predator behaviour in Musically pre-merge/acquisition in general) vaguely reminiscent of the "play now, my lord" times, fake X-out/buttons, incessant screaming/volume differences, abuse-esque ads (child voice begging for help + black eyes, etc)
The ads contain content that would get YouTube uploaders demonetised and suspended.