Getting the raw data is relatively straightforward, but my understanding is doing real time DPI at country scale without being easily circumvented (and without breaking the rest of the internet you want to work) isn't so easy.

If you want to really make sure nobody in the uk can easily access 4chan (PRC style) it needs some effort, and you're in an arms race with attempts to mask/tunnel traffic so it gets through

Splicing and mirroring a cable is about 10x easier than filtering it.

I think the conclusion is more like mandating home and business web access is proxied at a national level and most other protocols disallowed. Use of VPNs without a VPN tax stamp and key escrow is prima facie evidence of violation of the Counter-Terrorism and Security act. Use of non-standard protocols is assumed to be criminal intent. Check with your approved internet provider for how to access the Internet safely.

What proposed method? I'm explaining how things work. In order to send a packet, the destination address needs to be known to the delivering entities. Encryption occurs by using enveloping, the envelope is unencrypted, but the content is encrpyted.

This is how it works, if you want I can explain to you why it works like this, or you can work it out from first principles. But this is not a proposal.

VPNs are an asterisk and they work not by avoiding this natural unavoidable principle, but by tunneling, the VPN or proxy vendor is putting themselves on the headers, and on the backend they still route the packets to the destination by putting the intended destination on the headers.

If these VPNs don't comply with local regulations and are used to evade national restrictions they can and are often themselves subject to bans. But even if not, it acts as a sort of waiver and compromising element for all illicit activity.

Sometimes it's not necessary to completely outlaw something, it is sufficient to make it so that engaging in the outlawed activity is sufficiently uncomfortable and clear that it is illegal, forcing users to undeniably acknowledge they are avoiding the law. An example of this is trying to watch pirated movies without paying for them, yeah you can do it, but you gotta do some shady shit and dodge a lot of malware, and eat shady gambling ads and etcetera.

In addition to making you feel like an asshole, it removes any recourse you may have, it's very hard to make any claim later, you cannot really complain later if you were accessing it illegally to begin with. Nobody is going to pursue you to the end of the world not to access a pirated movie or an illegal website, but they pursue the distributor and make things very uncomfortable enough so that you are effectively hiding like a fiending outlaw.

This isn't what "militarize" means in this context or mostly anywhere

So has France, but their nuclear weapons program is new.

I don’t think it’s weird to point out the little guys (especially former or current EU) getting strapped.

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