So as I understand it...
Under American law, no non-US, person has any rights whatever with regard to privacy.
Any American company or company operating in America can be and often is required by law to provide bulk direct access to foreign communications and any associated domestic communications via national security letters.
By law communication of the existence of the national security letter is a major felony.
The NSA has a mandate and a nation state sized budget to monitor and interpret signals information.
The NSA actively captures data streams including the backbone providers such that in many cases they do store and replay significant components of internet and telecommunications traffic.
PIA is an American company owned by an American with routing and management of its network occurring that crosses the domestic and foreign traffic effectively associating the two together.
Does anyone feel that avoiding your isp to be tracked by a police state is a reasonable trade-off?
Those that say, oh but I use Tor... So you stand up in the middle of a fire fight yelling pick me, pick me while waving a big red flag and blowing off an air horn....
Ubiquitous use of encryption and traffic obfuscation is a solution but in practice the inconvenience to the consumer, the extra effort required by the provider, and the general existence of what could be described as a fascist state globally makes this unlikely.
Actually using these tools can easily identify or associate you with enemies of nation states.
The 5, 9, 14 eyes are no better and often worse than America. States like Syria, Egypt, etc use the same technologies with even less legal or ethical restriction.
At some point one simply has to accept that ones only effective right is to be irrelevant or simply indistinguishable from all the other noise in the machine.
... I'm off to go run TOR over PIA for no good reason at all except to piss into the wind. Mind the mess.