@mojubare. Generally, mining is rather expensive like u said — draining also. Mining activities have become less profitable lately, couple with fact that the market itself isn't entirely stable.

Very recently, Ethereum co-founder Vitalik Buterin shared his opinion about the rise of cryptocurrency mining on mobile phones

Vitalik Buterin: "Mining on phones is a fool's game. Goes against everything we know about hardware economies of scale and more likely to trick users with false hope than help them.
Staking on phones, OTOH, is IMO quite promising..."
https://twitter.com/VitalikButerin/status/1249692200369360897

However;

HackenAI is not about mining at all. The use ofbthe solution incentivise users. It's a passive way of earning. The project protect users from cyber threats and reward them with native #HAI token