Well five of the nine USSC justices disagree with you:
https://apnews.com/332abb7455cb4b60b2effc0852ff3c89
Most reptile businesses and sellers are small enough that compliance won't be an issue; they will fall under the thresholds set by the states (which of course will vary).
I wouldn't be surprised if frozen feeder sellers and the larger businesses like LLL and Big Apple will likely have to start charging sales tax.