"Extensive time and effort" would be a huge stretch to apply it to mining. I have a friend who has mined thousands of BTC working about 1 hour per week.
He spent hundreds / thousands of dollars to buy that mining gear, and continues to pay significant electricity and bandwidth costs to apply it to mining. Bitcoin benefits from his presence in its mining network. This legally constitutes consideration.
I would bet those laws were set up to go after contest scams. Something designed to get cheap labor under the guise of a contest. The thing about bitcoin is that there is no scammer. When you mine you work for yourself and none of your expenses go to bitcoin. They may go to the power company or Dell computers. But that is because you got power and a computer. No victim, no crooked contest business.
Victimless crime is still crime. Even tho everybody in a basement at an illegal poker game or in an alley throwing dice all agree to be there and accept the outcome of what happens, their activities still get raided by the police. Why would a Bitcoin mining warehouse warrant an exemption for running its illegal lottery?