Right: regardless of what the ad is, just by auto-clicking on it you provide a signal that when aggregated together can roughly piece together your browsing history. As a toy scenario, maybe you only visit tech blogs, and tech blogs usually have tech related advertisements. The fact that you have auto-clicked on ads that were on tech sites, and not say fashion sites, is itself a strong signal that can be used to infer browsing history.
Also I think advertisers are already used to dealing with click fraud and so track metrics that won't meaningfully be impacted by this strategy.