The fines are no doubt cheaper than actually doing something about it. Plus if they do something and are even moderately successful then he'd have less of an excuse for doing nothing about Russian disinformation and other bullshit.

I do. I know why.

Because they care about money, not harming children. This is why we live in a world where there isn't enough effort put into keeping children safe by rich people, because they prefer money to chlidren.

Money.
It would cost money.

Well now we know that Twitter doesn't care that there csam on their platform. Like couldn't even do the bare minimum standard of compliance