If you come across a post or thread that you believe is actively promoting misinformation (rather than just sharing their own opinion or the choice they made for themselves or their family, whether in regard to vaccines, masks, or something related), you should report that post just as you would with anything else of concern within the community.
The community support team will then take a look at the reported post to see if it meets the threshold of actively promoting misinformation.
We do not have the resources to proactively review every post made to the community ahead of time. The way we've always worked (and will continue to work through our team of volunteers) is via voluntary reporting of posts of concern by our members.
We have a 20+ year history of ensuring our community members abide by the community guidelines and ensuring we are not a place overrun by mental health misinformation. We will continue that tradition no matter the topic.