[tapland]

It seems unlikely that your child knows about every fetish adults have, and if they happen to send pictures of their feet to someone they have not done anything bad, they have not broken any unspoken general rule, there isn't a lot saying that is a thing you shouldn't do or any obvious signs as to why it would be bad. It hasn't exposed them in a dangerous way, but they have been victims to an adult going online and asking children for feet pictures to satisfy themselves.

Your reply implies that the child has been taught why it's just as bad to send a picture of their feet as of their hair as of their ankle as of their entire body as of anything. Or that they have parents who wouln't agree to them doing things that seem totally reasonable to them, and just freak out without any explanation.

Children are taught what nudity is very early. They aren't taught people's weird kinks. The difference between the two cases I mentioned is much greater than that between fentanyl and heroin. Both are not ok, but they are not even close in terms of possible adverse effects. You can't judge everything assuming the child has knowledge of the intentions of the abuser online. If your child sends the pictures because 'it's just feet, it can't hurt me' that's a much better reason, even though the child hasn't finished developing it's brain than 'my dad doesn't want me to send any pictures'.