@snow That is true, it's a valid concern. There is a lot of inappropriate images for younger or more sensitive viewers floating by in the Federated lines.
I have seen and read some articles mentioning the possibility of using Mastodon instances in education, but they would all be running in Whitelisted mode only -- selectively federating only with nodes included in the Whitelist maintained in each of those instances.
Smut for profit is not attractive, a shady side, I agree.