You can still read posts witjout federation. And you could still comment on theirs within your home instance. You just wouldn’t be able to post within their instance.

Whitelist federation is one strategy. Rather than defaulting to federation with every instance a proactively moderated instance would only federate with approved requests.

If you’re dependent on the drug that’s an addiction. You may feel that your addiction is more justified than others, and that’s ok. Humans have been using drugs for thousands of years both recreationally and medicinally.