I too have now been hit with this notification, ironically on a computer that I JUST reinstalled windows on. The second time that I logged into the computer, BAM, Commercial Use Suspected. This is ridiculous. I called customer support and they were incredibly rude as well, stating that they only speak to people on their help line that are paying license holders. I get that, but you need to up your game on the customer support front, TeamViewer. Even if you are telling someone that you can't help them, you don't have to be terse about it. Based on this thread, I don't think that I can expect any help or return on the email that I sent them about the error either.
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