From YouTube's Official Blog, "Managing harmful vaccine content on YouTube":
Today, we're expanding our medical misinformation policies on YouTube with new guidelines on currently administered vaccines that are approved and confirmed to be safe and effective by local health authorities and the WHO.
[...] Since last year, we've removed over 130,000 videos for violating our COVID-19 vaccine policies.
[...] We’ve steadily seen false claims about the coronavirus vaccines spill over into misinformation about vaccines in general, and we're now at a point where it's more important than ever to expand the work we started with COVID-19 to other vaccines.
Specifically, content that falsely alleges that approved vaccines are dangerous and cause chronic health effects, claims that vaccines do not reduce transmission or contraction of disease, or contains misinformation on the substances contained in vaccines will be removed. This would include content that falsely says that approved vaccines cause autism, cancer or infertility, or that substances in vaccines can track those who receive them. Our policies not only cover specific routine immunizations like for measles or Hepatitis B, but also apply to general statements about vaccines.
This now qualifies as "misinformation":
Hell, just quoting the long list of horrible side effects in Pfizer's own covid vaccine insert now qualifies as "misinformation.":