Some countries might have some sort of construction where you need to provide some form of identification but that only applies to the most obvious avenues to buy a SIM-card for the public. It's not like the shady MFA-farms with the 100-modem appliances are fed by a person actually buying 100 SIM-cards without getting caught or something like that... (and then there is false identification which often is a crime by itself but misbehaving persons might not really care about that)

AirTags in this case are just blamed because they are actually detectable by normal users, and that makes it an 'impression' problem, not a new problem.