51% Attack - Grin and Beam

[Oxumare]

We learned more about the 51% attack with ETC. ETC has been attacked three times (if I remember correctly) so far.Now using the Mimblewimble privacy technology, Grin and Beam were exposed to this event.This attack is happening to networks using the PoW model. (Like a fearful dream)
It is not known how much coins they obtained in this attack with rental mining equipment.
What is interesting is that there has not been a decrease in the price of these coins for now.

[hair]

why did this attack happen? is it because of a weak network security system? or a clever hacker exploiting bugs