Undocumented registry edits based on peoples guesses and other hacks from random blogs are not a solution.

Microsoft has used updates to change service and update names related to Telemetry already. Some of the "tips" in the comments are also wrong, like using the hosts file to block certain domains which Telemetry services don't respect.

Unless it's a documented method from Microsoft it doesn't count. Their stated aim is that all non-Enterprise customer will take part in "Basic" telemetry. Until they change that stance, random hacks from the blogosphere are at best unreliable and at worst dangerous and give a false sense of privacy and security.