>> illustrates that someone is mad at Coinbase and is lashing out
>That's an ad hominem attack.
No it isn't. I honestly wish that people would stop erroneously calling out logical fallacies. An ad hominem attack is refuting someone's argument by attacking their character in a way that has nothing to do with the discussion. For example, this is an ad hominem attack:
Obama: ObamaCare has insured 7.1 million people through the exchanges.
Sally: Oh sure, but what difference does that make - you're a muslim and want this country to fail!
That is an ad hominem. Because Obama being (or not being) a muslim is irrelevant to the discussion and is only used to impugn the character of Obama.
What is not an ad hominem attack is evaluating evidence of someone padding numbers to make Coinbase look bad and then determining that they must be biased against Coinbase. If you think evaluating evidence and coming to negative conclusions about someone is an ad hominem attack, then you are seriously mistaken.