One part of the "snooper's charter" is that it makes the ISPs / providers liable ("their duty") to store the content of I-Net sessions and provide access to this data for service, police & the tax office (not clear how all of these entities will share the data between each other or with the outside).
De facto this makes any end-to-end encryption or zero-knowledge services impossible to provide from the UK. If this propagates across EU / US / other countries it will bring an end to many cloud-based services & many saving governments & commercial are planning or envisioning for the next years. Wild guess estimate in damages to the UK (five years) - £100Billion + long term effects.
It seems the group of people pushing on this piece of legislation so heavily since years have not learned a bit from what is / has been happening in the UK and elsewhere for many years across industries (alternative reality: they want to create an very large income stream for themselves. This will nevertheless be most likely be short-lived at the cost of the overall UK economy / competitiveness - short- & long-term).
What has been proven over-and-over again in the UK (and certainly elsewhere as well) is that government or similar oversight is not working and is constantly abused by those given access to these means when large financial amounts / incentives are available to those who "bend" these processes / regulations / e.a. to their own benefit. At the same time those so far do not have to fear any reprisal / punishment. This is another shortcoming and clearly demonstrates that the true intentions of this legislation must be completely different from the labeling publicly provided - I'm talking about punishment along the line given to so called "hackers" in the UK / US - 10 years min. - but wait - it was the UK just recently that has removed all punishment for breaking the law 100'000s of times by some of its services (they couldn't make it legal without due process through the parliament so they just removed the punishment).
Let's have a brief look into how well "oversight" works in the UK:
- News of the World (data / access sold off by government employees)
- UK Mis-selling saga with PPI - unique case as almost £30Billion in compensations have been granted - non-working financial oversight
- Gold fixing scandal - non-working financial oversight for many years / decade
- FX fixing scandal - non-working financial oversight for many years / decade
- Bailouts / 2008 financial crisis - non-working financial oversight for many years
- NHS data leaks - no due process and proper data protection
- plenty more to add ...
... crime and abuse of the rules happens when an opportunity is provided with incentives and no reprisal.
IMHO - that is the biggest danger from all these almost limitless surveillance laws and powers provided without checks.