25% of nothing is still nothing
The problem with Google, Microsoft, Apple, Amazon etc is that they are falsely attributing costs and revenues in order to declare a reduced or zero profit in the UK. It doesn't matter if the rate is 20%, 25% or 100%, the Treasury won't get anything. This is a deliberate attempt by the government to claim to be doing something while in fact doing nothing. It is worse than doing nothing as it has the appearance of having solved the problem, taking public attention away from it.