Benjamin Powers and Colin Harper have done a detailed report about crypto scams in Coindesk.
It is a long read but as crypto users and hodlers we all should be aware of them otherwise sooner or later we may very well become victims.
Source credit and full story - https://www.coindesk.com/crypto-scam-apps-in-app-stores
How to build your own bitcoin mining pool for free:
@successforall/poor-man-s-bitcoin-why-i-use-crypto-tab-browser-as-my-free-bitcoin-mining-pool