That is a slippery slope though, because the OS vendors could offer Law Enforcement everything today, and there will be a special request made for a little something extra tomorrow.
os-vendors are predominiantly us-american and the rest of the world has to get their lawful interception on the free market, no?
No way any reputable OS vendor would agree to enable, for example, Dutch intelligence services spying on Russian citizens living in the UK.
I don't even need to invent a scenario for this: you can buy the TSA master keys off Amazon right now. The only reason why it's not a huge problem is that TSA locks are a special thing you buy and use solely for airline luggage that is already in TSA custody anyway. If you use TSA locks on anything else, however, you're just asking for it to be stolen because the locks don't actually provide any security.
The shady clients will get their hands on any intercept key provided by law enforcement, because it's legally unreasonable for Apple or Google to only provide intercept capability to some of the countries they operate in. e.g. if you give the US and UK a decryption key you also have to give it to Saudi Arabia[0]. Hell, in some countries the shady and legit clients are part of the same government - e.g. you can't give the key to just the FBI but not the NSA or CIA.
[0] The Saudis have one very big lever they can use to force the west to do what it wants: gas prices.
The United States gets most of its petroleum from Canada.
Saudi Arabia accounts for only 7% of U.S. petroleum and crude oil imports.
Source: https://www.eia.gov/energyexplained/oil-and-petroleum-produc...
2nd is Saudi Arabia then Russia. However it happens that US is also the largest consumer and their production doesn't meet the demand so they have to import from other countries like Canada and Saudi Arabia
So Saudi Arabia most definitely does have a lever, and so does Russia since the rest of the world including US allies like Japan, South Korea, Australia, NATO countries depend on their lovely black gold to have functioning economies.
https://www.api.org/news-policy-and-issues/blog/2018/06/14/w....
Have you been following the news for the past two years? Russia's sanctioned up the wazoo. No NATO country is buying Russian oil. India is now their number one costumer.
https://www.aljazeera.com/amp/news/2023/5/16/eu-to-curb-indi...
If the US was like Saudi Arabia where they exported half of their oil, and could supply most of the world at competitive prices, Russia would have really felt the Sanctions.
But right now Russia doesn’t feel the Sanctions. They’re more isolated and Putin’s propaganda has somewhat worked at making the general population anti-west and support the Ukraine invasion.
This strategy mostly works because the major operating system suppliers refuse to implement requested lawful intercept solutions for their consumer products. Instead, we end up with companies that try to fill the gaps, making a business of exploiting security flaws. It's possible for the OS vendors to completely dry this swamp, by offering competing services to law enforcement using the interfaces they already have (automated software updates, for example). The reputable clients would migrate rather quickly. These companies would be left with just the shady clients, making it much more difficult to justify their continued existence.