Well I'm more thinking of the problem that browser extensions had, where people would make something handy or fun, be granted perms by the user, then get sold to people looking to mine user data. Extension authors get solicitations for these sales constantly, and the sale prices can be really tempting for devs. A friend of mine just made a silly "cursor sparkles" extension and he's mentioned multiple of these emails.

Regardless of how you feel about it, the Cambridge Analytica ordeal was entirely about using benign quiz apps to mine user data, and the pressure that Facebook received was to fix their security. That's a huge incentive to lock down fair access. So if this is the situation, we need to address it if we're going to fix the technical pressures that create monopolies.