It actually became more frequent when sms became free in my country around 2010 / when people switched to services instead of sms.
But it has also become easier to block messages on most services so it keeps the balance.
The age doesn’t matter. If anything, they usually become creepier the older the guy is.

In Germany they provide relief from the constant fear your vpn might leak and you’ll receive mail.

If the idle game is running at 100% there is no power left to also crypto mine. If the idle game runs at 10% you could use 90% for mining but then you would pay for 100% energy usage instead of 10%. You’d probably end up paying more than you’d mine.