Do I think they made the right call? Yeah, but I'm a dum dum on the Internet who has thought about this for all of 5 minutes. There might be some better form of this argument that's more nuanced than I have time to understand, so I want to be able to leave it up to ICANN to figure stuff out like this and do what's best.
Yes, but it isn't a fallacy which is occurring here. Provisionally accepting the reasoned opinion of a domain expert is a rational choice in situations where re-evaluating everything from first principles is not an option. This is not an appeal to authority unless their conclusion is taken to be true simply because they are an authority, without regard for how that conclusion was reached. There is naturally room for error; you're trusting in the expert's skill, experience, logic, motivation, and above all honesty to collaboratively assembly an argument larger than you could put together on your own, and each party must do their part. If the expert's reasoning is deceptive, flawed, or misinterpreted, then the argument falls apart—but you're not just taking their word as fact, you're trusting them to produce rational conclusions from the evidence in the same way that you would if you had their knowledge and experience (and unlimited time).
Naturally, some experts are more trustworthy in any given domain than others. Anyone relying on Putin for conclusions on just about anything (even his own self-interest) is likely to be disappointed.
But I absolutely agree that ICANN made the right decision. It would have set a horrible precedent.
Russia getting cut off from financial services is also a huge problem for every day people with families there. Right when the Ruble collapses, we have fewer and fewer means of supporting our families over there. I get the why, we are trying to cut off Putin and the oligarchs at the knees, but it's sad that everyone else is getting swept up in it.