I think it’s certainly reasonable to ask whether the police would have spent 1000s of hours and financial resources going after Joe Bloggs for a similar alleged set of crimes that took place around 20 years ago, even if there was in theory some evidence that gavesome possibility of a conviction (eg, a couple of potentially incriminating text messages)
But then, rightly or wrongly, the Times/Channel 4 instigation had already got the ball rolling on contacting victims etc so I guess they figured there were was the basis of a case there. And of course the fame and high profile nature of the Sunday Times investigation also arguably would have made it impossible for the police NOT to then carry out a thorough investigation of their own.
So in a sense I’d agree that the same level of fame which provided Brand the “cloak of celebrity” when he was doing what he was doing in the 90s and 00s, that permitted him to get away with so much, also 20 years on played a significant part in his downfall.
If you what to get conspiratorial about it, his mistake wasn’t starting to talk right wing BS on YouTube (I don’t believe that theory for one minute) it was rather acting alone rather than in cahoots with more powerful people who he could have threatened to take down with him. As it was he was instead just famous enough to make an attractive story for the Sunday Times etc - but not powerful/well connected enough to have any serious protection (eg like multiple past politicians, Epstein associates, Hollywood royalty, Trump etc)
And speaking of Hollywood royalty, let’s not forget that Polanski is living out a comfortable life in France having admitted to the exact same crime as Brand, only commited against a child. Horrific.