At least you are not a target for a missile. For a lot of people right now it's the best what they can hope for.
This decision will not prevent a single missile from being fired. On the contrary, it will put more power into Russian entities.
1) The fact that they ask to move Russians to other registrators, is just barely an inconvenience. It cost me 30 seconds to create a ticket in scrum and developers will move everything. But misjudgment by nationality is bad. Imagine if all Jewish customers will get such letters because Isreal/Palestinian war?
2) Catastrophic is this: instead of using millions of dollars from Russian customers to help to save Ukraine and lives - they steer away from this money to governmental control Russian registrators. In other words, their CEO Richard just send this million dollars to Putin instead of Ukraine. That will cost lives.