Someone else used my email address for their Ubisoft account. The problem with this is that Ubisoft doesn't verify addresses, so I end up getting a bunch of junk from them (maybe things they should not be sending me too...). I looked for an email contact form to ask them to remove my address from the account. No dice. Their Twitter person said to call Ubisoft Support. Not gonna do that, so now their user isn't gettin…
From your perspective, you have solved the problem. Gmail will no longer display emails from them.
The greater problem is also one step closer to being solved. The spammers, in this case Ubisoft, have been correctly identified as spam by you.
Even if you were an Ubisoft customer, if you couldn't get them to stop emailing you, that would be spam.