Civil servants can't be trusted to stay in their remit and will always try to widen their remit.
Endgame. Spy on everyone all the time forever.
Whatever way you look at it it's wrong.
Treats everyone as a criminal. IE No presumption of innocence.
Hugely expensive. AFAIK this has never been subjected to any kind of cost/benefit analysis. The UK govt wants to spend >£500m/yr to maybe prevent another 7/7 event which killed fewer people than are killed on British farmyard accidents. Does "Terrorism" sound more like an excuse than a reason?
In the US you are looking at secret warrants issued by a secret court whose and if (as a company) you argue with them you are not even allowed to say that you are arguing with them.
There's a reason people call that Kafkesque.
All countries have telecomms monitoring methods that can monitor specific calls/websites/computers and laws that allow them to be used provided there is some evidence. Any society that does not want to be a police state had better use them.
Once you have data collection without warrant for everyone why not have have detention without trial for everyone.
Let's strip the "terrorist," and the other classic "paedophile" and "organised crime" BS from this.
The civil servants behind this want to do it because they ca and it will give them considerable power. and they can trade their stuff with their opposite numbers. You spy on my nationals, I spy on yours. We're only spying on foreigners.
It is grossly disproportionate to the crime it allegedly counters. It is a fetish without reason. A compulsion.