Re: Single point of failure
"What are the alternatives to TSMC?"
For sub-10nm capacity, in 2020, TSMC reportedly have 60% of the instaled capacity globally with Samsung and Intel sitting around 20% each. So that gives the alternatives Intel has.
Those percentages will change - all 3 have ordered more systems with the lion's share likely having done to Intel as they were behind TSMC in the queue. For other parties, Intel/TSMC may look to offload "first gen" 7nm/10nm equipment but there is unlikely to be supply for any other vendors in the next 5 years.
Note: these are educated guesses based on various press releases. Getting exact data is hard.