Most AUPs ban the use of programs designed to use 100% CPU
A well-utilized Tor node will max out CPU...
Mine hasn't. It peaks at about 30%. It can't even hit the 150Mbps limit I set.
Let me rephrase it then: a well-utilized Tor node _can_ max out CPU.
I have two guard/middle nodes with maxed out cores. CPU is actually their bottleneck. They have high consensus weight and get a lot of use though.
My point was just that if a VPS provider has a policy against software that maxes out CPU, Tor could cause that condition. Whether or not a provider would actually enforce this against a Tor node is another question. I haven't heard of it happening but ¯_(ツ)_/¯