I don't know about WA, but here in WI unemployment is a % of income up to a rather low limit.

I can tell you exacly how much UC an unemployed experienced technical person in Wisconsin is receiving: $324/week. No more, and assuming a pay rate anything near what the old going rate was, no less.

And refusing an offer kills that. On the other hand, flipping burgers only partly kills it (%65 of income from under-employment is deducted from weekly UC - but that stretches the checks out, so, as far as I can tell, burger flipping does not reduce total UC benefits and somewhat increases current income) and, I think, allows you to turn down temporary work.

(NOTE: this is my non-lawyer interpretation of a pamphlet from the UC people. A pamphlet, I might point out, that would have gotten me fired for cause (ineligible for UC!) if, as a professional tech writer, I had had anything to do with it. Anybody who mistakes this for legal advice has worse problems.)

So any company that wants to pull that stunt here has perfect information to work from.