The pirate bay already abused its users by covertly running a monero miner at 100 percent CPU power. If they had revealed that they wanted to move to a browser mining funded model there would be no problem.
If you guys would go and read why they did it and what happened with the 100% mining rather than just claiming they are trying to do you dirty you might understand a bit more. All these click bait headlines claiming it was done nefariously is such bullshit.
The 100% usage was a mistake, it is now set to 30% cpu usage and only on one tab no matter how many tabs you have open. They publicly posted about this and asked for feedback yet everyone is running around saying they are just trying to steal your CPU cycles for their gain. They are TESTING this as an alternative to ad revenue.
They also explicitly state that current gen adblockers will stop this from happening if you dont want to participate.