Maybe it's time for you to stop using Facebook altogether.
Suggesting the OP should leave Facebook is called avoiding the problem, not providing a solution. It's pragmatic, for sure, in much the same way that avoiding a bully may help you avoid beatdowns, but it does nothing to address the underlying issues he was speaking towards.
Your continued use of the site IS their explicit permission that they can serve you their content
A) No, it is not. Explicit permission would require an explicit action, such as clicking a button to say you agree to their terms (and even that may not be sufficient). Moreover, as anyone who has ever accidentally visited Facebook without signing up for an account can tell you, Facebook is more than happy to shove ads down your throat without you ever having agreed to their terms of service, either explicitly or implicitly.
B) Just because someone serves you something, it doesn't mean you're required to accept it. Facebook is doing the Internet equivalent of a restaurant chef coming into the dining area in an attempt to force-feed customers burnt hunks of food that the customers had cut off. Facebook can try all they want, but we can, and are, rightly offended that they would try to do so.
Besides which, even if visiting a site constituted granting them explicit permission to serve me up anything they wanted, that still wouldn't mean that they could actually serve up anything they wanted. I was one of the first 50,000 users on Facebook, but I left it back in 2009 because of their already-evident cavalier attitude with regards to my privacy (e.g. on multiple occasions, making things public that I had explicitly marked as private). Shortly after my departure, Facebook had to pay US regulators millions of dollars in fines and was forced to retain a compliance auditor for a decade or two as a direct result of the issues I left over. Turns out that even though I and millions of others had explicitly agreed to their terms of service, it didn't mean that their abusive behavior was legal or permitted.
All of which is to say, just as many of us would stop going to restaurants if chefs behaved like I described above, many of us have stopped going to Facebook for the same or similar reasons. But taking your advice and leaving the site hasn't done anything to fix the underlying problems. The bully is still a bully and their behavior is still reprehensible. Why people continue to tolerate Facebook is beyond me.
Leaving was the best solution I ever implemented. I haven't had to "fix" privacy settings for the better part of a decade now.