It depends on what coin or token will be mining, if building a mining rig it really cause high, the electricity bill will consume more and the maintenance of the mining rig but it is legit, but if the miners will join in a cloud mining I think it sound so scary because more people got scammed using cloud mining.
cloud mining is not that good. if anything is profitable but usually it won't last long. more difficult mining may be the solution but the calculations for the assets mined and the expenses will be difficult as miners usually hold their assets long enough to get better value.