I don't understand how it could be considered consumer fraud or computer fraud and abuse if it was clearly indicated to the visitor that their browser would be

I don't understand how it could be considered consumer fraud or computer fraud and abuse if it was clearly indicated to the visitor that their browser would be used as a BitCoin miner in lieu of being displayed Ads. Assuming they weren't told, I could see the issue but it didn't seem like they were trying to dupe visitors.