A classic of the genre: http://orteil.dashnet.org/cookieclicker/
And a place to find more: https://www.reddit.com/r/incremental_games
And a place to find more: https://www.reddit.com/r/incremental_games
But never attribute to malice that which can be adequately explained by incompetence.
I seriously doubt that. It's not just "inefficient", it's completely useless for bitcoin mining. It's something like spending $1000 in electricity to make a cent or two. It's not even worth the time to hack.
If you had that much cpu power under your control, you'd make more just selling it on darknet for 1% of its cost.