You might have better luck blocking it at the network level. The downside of that is, depending on what is being sent over the network and why, it may no longer work. If you have to punch holes in it for server access, for example, now you no longer have any guarantee that the server port will not start collecting and sending telemetry that way. You also have no guarantee any server you connect to isn’t also gathering and sending telemetry if it has network access to that port.

I think this is the way. But what domain to block?