I think it's a perfectly good question, unless we're planning on simply declaring commercial food safety off topic. It seems fair to ask if food safety extends to cleaning objects like these, not just normal dishes and the food itself.
It asks about specific things. There could well be data about compliance (government food safety inspections do happen, I hope), or resulting sanitation (by third parties) - and these things would probably be publicly available. And while it's unfortunate that this is (in the US) regulated at the state level, the laws do exist - with enough work, someone could certainly say "X out of the 50 states require this". I see all this as a good thing - rather than asking simply "should/must you clean these things?" it's asking for actual data and authoritative rules, which is what we sometimes forget to aim for with food safety answers.
As long as someone's not asking "is it legal/illegal to only wash X every N uses using method Q", it's not really a thorny legal question. It's fairly analogous to "what does the FDA say about this safety issue" - there are regulatory authorities saying what's considered safe.
I think it's important to keep in mind that some quite reasonable questions are difficult to answer well - they'll require some research, which someone else may or may not have already done - but this doesn't make them bad questions. It makes them the kind of thing we should strive to be able to answer.
The real problem is people posting speculative, incomplete answers, and us endorsing those via our voting. janeylicious' answer is a pretty reasonable stab at the legal side - it's local to California, but that's a big state, and other states do have laws too! (I think the voting is artificially high on her answer because people are applauding her for what she does, rather than the answer itself.) The other two attempt to address compliance, but don't do so terribly usefully, saying essentially "they do" and "they should but don't always". That's why there's a downvote arrow - you can downvote things that don't usefully answer the question.