The number of people that understand the details of how a refrigerator works is orders of magnitude higher than the number of people the really understand everything about cellphone technology. But yeah, the hum is not pleasant, has that been studied? ;)
I feel like for something to stick there does need to be more than that. But who knows, give it a try and see! If you look at the common conspiracies they seem to target more complex things.
Anti-vax is a lot more complex. There was Andrew Wakefield's fraud. There are real side effects for many vaccines. There are public health considerations. The science is definitely not at a fridge level. Pharma companies can have conflicts of interest. Maybe the original cowpox gives immunity to smallpox is more intuitive but mRNA vaccines that cause cells to make the Covid spike protein are not as simple. Covid vaccines were rushed to market (one can argue for good reasons) and they did have side effects (e.g. myocarditis, tinnitus?). Authorities have walked the line of being open about the considerations vs. trying to force public health policies, sometimes eroding trust while they do that. Even experts differed on some finer policy points. I know I was really upset with people who didn't vaccinate for Covid because I believed we could get herd immunity but then new variants showed up that were so more infectious and got around the vaccine where that didn't matter.