And "become customers" means it will become mandatory to sign away your rights to a foreign corporation by agreeing to their terms of service. This kind of abuse of power is a clear example of why the UK needs a real constitution.
And if Google bans you for some reason (which they have been known to do sometimes), I guess you'll be kicked out of the country unless you buy an iPhone.
Well, maybe the app will keep working and you can update it from Aurora Store, or maybe you'll be fine as long as you don't change your employment or residence. Pretty vague so far.
A real constitution is not a vague collection of traditions. Every other country understands "constitution" to mean a written document. A collection of traditions cannot meet the primary aim of a constitution, which is granting people clear and unambiguous rights.
Furthermore, a constitution is generally more difficult to change than a law. The Human Rights Act can be repealed by a simple majority of MPs voting to repeal it.
If it's the former, then it means it's now mandatory for all British citizens to become customers of the Google/Apple duopoly LOL