hilariouschaos’s most active and presumed lead site admin Alice makes many posts and also mods numerous communities, including https://hilariouschaos.com/c/diedsuddenly . This community sidebar’s first assumption for a person dying is that it is due to vaccines, rather than literally anything else.
Full disclosure, it’s something I remember being said. Got no direct proof of it ATM. But there are a lot of rightoids and adjacent on that instance. I have it filtered iirc.