Millions of Mac users likely use Yahoo services.
What makes them crooks? Unethical, yes, but crooks? Was there a massive stock sell off in 2014?
No one has been criminally indicted, much less charged, so I suspect that language was being used casually. However, the problem here is that Yahoo did make financial disclosures, some of which arguably are inconsistent with prior knowledge of this issue. Securities violations can subject corporate officials to civil and criminal liability. It doesn't take a stock sell off for a major securities violation to occur, and corporate officials are responsible for accurately reporting to the financial markets.