Can you characterize what you consider an invasion of your privacy? Can you bound what you would find reasonable for someone else to characterize as an invasion of privacy?
Personally identifiable/private information about an individual being made available to another individual without consent from the subject. Gmail running an automated algorithm over your mail and suggesting an ad doesn't do this. If an actual person was reading all your mail, something you generally have an expectation of privacy in dealing with, or the advertising profiles advertisers use were leaked in such a way that they could be attached to the specific individuals they're related to, that would be an invasion of privacy.