A lot of times I’ve heard people say that if something is free then you have no right to complain. This argument has always bothered me because most of these so-called “free” services are anything but. They have advertisements, collect data on you, or most likely have some combination of the two.
If advertisements or data collection is involved then you are the product being sold. Your privacy and personal information is being collected. You are involved and thus you have a right to your voice being heard. Complain, draw attention to problems, and criticize in order to help improve the conditions of your interaction.