In the RISC space they are, currently, almost de facto monopolistic (we’ll how RISC-V will go, hopefully). X86 is fought between AMD and Intel, this gives us a leeway on how much scummy either of the two are. ARM is very competitive because they chased many industries so far, the last one is x86: if Intel and AMD go for ARM’s RISC, they will basically subdue themselves under ARM.
It’s not about ARM being a good or bad company, the issue is when a company become monopolistic they are basically forced into change their founding ground.
Valve is an example of a company that tries to avoid monopolies (even self one) as much as possible.