The problem is that the ads model works for a while, then they realize it doesn't anymore and they change the free tier. This seemed to have happened recently

The problem is that the ads model works for a while, then they realize it doesn't anymore and they change the free tier. This seemed to have happened recently with gmail. Impossible to know what the eventual monetization model will be when signing up. I think this is the justified cause of the mistrust. Also there are the observations 'free as in beer' and 'if you're not the customer you're the product.' Both of which have merit.