The problem for that is the NSA staff and friendly nations around the world.
What the NSA holds back from US OS and US tame telcos is shipped as international standards.
The cyber security tools get handed around for international and domestic use. Australia, Canada, the UK, NZ, then down to the third party nations and some other nations. Thats a lot of local staff using tools, methods, systems everyday on and with US telco and computing standards.
At some time the staff enter the private sector and take their skills with them. A bank, security firm, political party or rival telco now has the same deep gov skills and telco methods.
At some time the a staff member gets removed and is less welcome in the the private sector with their skills. No bank, security firm, political party or rival telco job.
So other nations and other groups make great offers. The cash is good and the work is as interesting. Now some random people or nation has the same deep gov skills and telco methods for cash.
That is why telco and computer crypto standards need to be very good. Too many ex or former staff, nations, groups and people can afford the same skills if the keys, codes and tools are just left in the open or are designed as junk standards.
The US and UK govs have guided very weak telco and junk computer standards over decades. Tame OS and telcos have allowed junk crypto to spread under their own brands.
What was crypto junk for an embassy in the 1950's buying communications hardware is now the global standard. Everyone with cash and connections can now track or get plain text too. Are the police in a phone network? Are the police sending a request to watch a list of numbers? Get a real time update and escape before the telco even sets up the tracking and logging.
All thanks to junk telco and OS standards by updated tame global staff. What was great for hunting spies on any telco network can now be used to track police intercept requests by any group with cash.
Want to track political leaders or protesters for any reason? Just have the right codes and a national cell network is for sale by ex or former staff.
What the NSA and GCHQ saw as instant, real time access for their own is now open to all. Thats why good telco standards are so vital. If one group can get in, everyone can.