I don’t think getting freebies from them counts as supporting them

I do. Some examples off the top of my head:

• giving them access to your stored data, by letting their code execute on your computer
• giving them access to your behavioral data (a form of biometrics), through the same
• giving them access to your system fingerprints, through both code execution and account creation
• giving them legal influence over you, by agreeing to their terms
• giving some of their legal arguments greater weight, by increasing their market share
• giving them greater sway with publishers, such as when seeking exclusivity deals, by bolstering their user count
• giving them greater value to investors, by the same

There are probably other ways in which it supports them. Those are just the first ones to come to mind.