I have seen different Cloud Mining App and websites that claims a user can mine Bitcoin and other Cryptocurrency.
All of those so-called cloud mining apps are fake... They take advantage of the computational resources in your phone in order to mine another cryptocurrency
[e.g. Monero] and then it converts them to
BTCitcoin and while you're using those apps, you're also destroying your phone in the process
[in some way]! In regards to cloud mining websites, almost all of them are built to scam their users!
I just want to know if a substantial amount of BITCOIN can be earned through cloud mining and is it really worth the time?
No, it's not worth the time!