https://support.google.com/docs/answer/148505?hl=en
has 13 items on it. Not exactly unreasonably long list to check, especially if you are in the porn industry where you should be aware that there are plenty of restrictions (justified or not) around porn. If you didn't happen to be aware of that, consider this a lesson learned the hard way.
I have been using Google Drive for many years and I was never aware of these restrictions. I wonder how many Drive users were aware before seeing this article. If it is less than 50% (and I would be surprised if it isn't) it is Google's fault not individual users.
This misses the second point of my parent comment; if you are in the porn industry, you should know that plenty of services do not want your business, and as such be far more diligent than the average joe in checking ToS for the services you are building your business on.