~snip~
The Antminer S17 calculates approximately 67 TH/s and costs $1600 to purchase.
The attacker is going to need to purchase:
120,000,000,000,000,000,000 / 67,000,000,000,000 = 1,791,045 Antminer S17
I'm not sure how long it would take Antminer to manufacture 1.8 million S17 units, but let's pretend they just happen to have them sitting in a warehouse waiting to be sold...
That's going to cost the attacker $2,865,672,000
Have to take my hat off to you, there are some serious calculations there
The reality is the only winner in any such scenario would the Antminer manufacturing company