In coal mines, canaries sang as a warning--so your analogy here is unfortunately very wrong.  Too bad she didn't give any warning that things were going kablooey at FTX or Alameda, but I'm guessing she was clueless.  But I've no doubt you're correct that she's talking to authorities with a promise of some kind of immunity. 

OP, I don't know how important these texts are in the grand scheme of things.  They do make it look like it was amateur hour at FTX at least, and probably Binance as well.  But stuff like this comes out after every big financial disaster--the only difference with these texts is that they have to do with the crypto industry. 

Eh.  We'll see.  The whole story hasn't been told yet and it's still relatively early on in the process of investigation, prosecution, and forthcoming regulation and whatnot.