My experience has been starkly different from Sterile_Techniques and I'm also living in what might be termed as "the middle of Ya'll Quaeda" USA. So, it's interesting to hear that there's such a big difference in opinion / understanding on this topic.
For sure, 20 - 25 years ago it seemed like almost nobody had heard of it, and whenever someone said they were allergic to meat because of a tick bite, there was a lot of skepticism and denial.
However, these days, pretty much everybody knows someone who has this allergy, and that's no exaggeration. Even the most backwoods, anti-science, do my own thing, fuck your feelings kind of people are telling others to check themselves for ticks and/or taking steps to keep ticks off them because they're aware of all the risks from tick bites. Now, they might be claiming that it's government bio-warfare, related to 5G and/or covid, or some other unnecessarily contrarian bullshit, but they do take it seriously from what I've experienced.
Also, the good news is (or bad news I guess depending on your perspective) is that a lot of people seem to experience improvement of symptoms in time, so it's not necessarily a permanent thing for everybody. I don't know if it's just that some people continue to test the limits and end up inadvertently putting themselves through exposure therapy or if the immune response itself just naturally wanes over time, but several people I know who've had this for 5 - 10+ years say they can usually get away with a small amount of mammal meat, like maybe a hotdog now and then at a minimum, even though a small bite would have caused them a lot of trouble when they first developed the allergy.
For me personally it's the "almost nothing else" that went into the dishwasher with the plunger that truly pushed the narrative into holy shit territory.