WordPress.com users cannot install plugins. WordPress.org has separate forums.
WP has a right, even a responsibility, to try to make some income from products, features they incorporate or develop. That remains true for products and features previously given away.
What I object to is that I never see warnings about major changes before they are rolled out, no attempts to explain how the changes might adversely affect your blogging experience, and, after the damage is done, seldom an admission that this is in fact the case despite dozens of irate users explaining precisely how their blogging experience has been degraded and/or ruined by certain changes. Rarely, if ever do I see an attempt to explain the purposes behind the modifications made in "updates," or an admission that an inherent result of the changes implemented is often that the user might have to pay in the future for a feature or set of features that had been free for past three, four, five years.
Also, I've never heard them ask us to test and give feedback on "updates" prior to their being implemented. Instead, they are just thrust upon us, as if there were no reason to ever consider whether users might raise legitimate objections, or suggest reasonable alternatives, to proposed changes.