If you're curious, there has been a lot of research into how these scams work, and why:
https://www.science.org/content/article/antivaccine-activists-use-government-database-side-effects-scare-public
https://www.washingtonpost.com/investigations/2019/10/15/fdc01078-c29c-11e9-b5e4-54aa56d5b7ce_story.html
https://www.mcgill.ca/oss/article/controversial-science-news-quackery/murky-mercola
https://www.codastory.com/waronscience/social-media-profit-pandemic-antivax/
https://sciencebasedmedicine.org/scientific-review-articles-as-antivaccine-disinformation/
https://www.npr.org/2021/05/13/996570855/disinformation-dozen-test-facebooks-twitters-ability-to-curb-vaccine-hoaxes
A very enjoyable and informative article from WIRED:
https://www.wired.com/2009/10/ff-waronscience/#:~:text