Tell me, who exactly is running ML on this data? They're going to great lengths to anonymize this data. If they wanted identifying information, they'd just upload your unixname, they wouldn't anonymize and then de-anonymize with ML.
I don't even know how you conflated the metrics on menu clicks with uploading paste data. That's ridiculous. Did you even notice you made that leap?
I don't know what data they collect now or what they will collect later so I am just speculating. But I am sure the ToS has a section about how they can change the terms however they wish.
Please tell me about the great lengths they go to anonymize this data because I believe it to be very difficult to do, and absolutely not in their interest.
Edit: With pasting habits I meant if you paste with shortcuts or go through the menu, not the actual paste content. Sorry for the confusion.
Search engines are recording really detailed information as you type, as you browse other websites using their invasive trojan-like analytics. With this data you can probably identify anonymous users from their behaviour (even if the ipv4 address is "encrypted" hah). All it takes is for data from one company to end up at another company and I believe this happens very often.
I think the problem is that you need less and less information to personally identify someone as you have more data. We are not intelligent enough to know what data is identifying or not so therefore the only option we have is to stop giving out our data.