In Italy we have an "indipendent research lab" that become really famous for a study that demonstrates that aspartame may cause cancer.
The same institute published few years later a study about 5G emissions that may cause cancer.
https://www.efsa.europa.eu/en/news/efsa-assesses-new-asparta...
We covered it in this podcast I used to produce (not explicitly the subject, they came up re: artificial sweetener studies and we explored them a bit). They’re very good at appearing legitimate while pushing wild claims.