It is perhaps worth highlighting that Mozilla has done this in response to a specific UK government consultation [1] all about "growing up in the online world", which has, buried about 30 pages deep, a specific question about age-gating VPNs and similar technologies.

As far as I can tell, there is no requirement to be a UK citizen to answer this – if you are, were, or could be resident in the UK I urge you to fill it out and help provide a voice of reason...

[1] https://www.gov.uk/government/consultations/growing-up-in-th...