Recorded speech about engaging in crimes is often acceptable evidence. It’s probably the same with written messages.
I guess it’s up to the accused to prevent law enforcement from acquiring what they said, whether it be preventing recording, preventing police from sifting through mail or unsecure communications, or preventing police from acquiring the accused’s copy of potentially illegal communications. Which he is currently attempting.
I don’t blame him for trying, and would agree on a lesser extent that he is right to prevent self incriminating now. But copied communication as acceptable evidence is pretty settled in law by now.
Okay so I haven’t heard about her before this but, from this thread and a quick google search, I feel like I know enough. Anyway. I’m hopeful then that the fame will pass— lots of internet fad celebrities fade and become more or less normal people again soon— but she pockets enough money to live a good life and keep paying it forward.