Corporations hide crimes all the time, even when they are the victims. If the crime will lose them money in any way, either directly or from a reputation hit, it’s very likely a company will not report it.
It only because the employees involved had their NDAs expire and confirmed they saw some very fucked up things that we know what he did.
Twitch fired him publicly when he was one of their biggest streamers. It’s fully possible the explicitly sexual messages are a crime, but the parties involved, including the minor victim, did not want it reported.
You can argue amazon should have reported it anyway if it rose to that level, but with none of the involved parties forcing the issue, it makes sense from a buisness stance not to.