It's not evidence, but it may well have been used to hide such evidence.
Well yes anything that's encrypted could potentially turn out to be evidence of a crime when decrypted, but we don't usually assume that the use of encryption is indicative of that
For criminal cases. But this is not.
Yes, because large corporations never commit criminal infractions, or admit any wrongdoing. They just happen to settle with regulators as cost of doing business.
Edit: Oh, you mention the encryption. Big companies love obfuscating everything they create, because they're afraid something commercially sensitive will exist there and someone will copy it and outcompete them. I agree that this is ridiculous, but I don't think it's evidence of any sort of nefarious activity.