Collecting "telemetry" on minors, specifically under 13, without the minors' parents permission is illegal. In order to collect telemetry, they have to restrict the application's use to those over 13 (added to their privacy policy, for some reason, but I suspect that would not be satisfactory), which violates the "no restrictions on use" clause from the GPL.
This seems to be a bad interpretation. This is not adding restrictions on use, this is complying with other legal restrictions that are already there. If that were true, you wouldn't be able to have things like chat clients be GPL, because the same restrictions would apply there with allowing chat servers to collect data.
I suspect there would also be an argument that an intentional distributed system like a chat client/server would be a different beast from an application like an audio editor.
Any interpretation of GDPR expansive enough to prohibit children from using software containing an auto-updater would also certainly prohibit them from sending an email or browsing most websites.
[1]: https://www.ftc.gov/tips-advice/business-center/guidance/com...