absolutely shocking that every single response to this post is just clueless maxi incredulity. they can't accept that proof of work has any flaws, because it contradicts their firmly held religious beliefs
Discussion
If you had to acquire new ASICs to 51% attack Bitcoin, then there is much more than money at play, the scarcer commodity would be getting the required allocations from TSMCs fab to make the vast quantities of high end chips required. This is the hardest part about making Bitcoin Miners at scale.