I really doubt any cloud mining platforms can be successful nowadays.  Its probably all a big scam or Ponzi scheme.  You cannot take shortcuts if you want to seriously mine bitcoin and  you need real equipment.  Folks buying up ASIC miners are not fools.  If cloud mining was legit, why would anyone bother buying their own hardware?

Im just skeptical of any promises of easy money or free lunches when it comes to crypto.  Maybe Im too cynical, but it often seems like people's greed blinds them to obvious red flags.  They get drawn in by fantasies of effortless wealth. 

Some cloud platforms may prove me wrong someday.  For now though, if it seems too good to be true, it probably is.