Just what we needed...more satellites

I seem to have not noticed this development:

China on Tuesday launched the final satellite in its homegrown geolocation system designed to rival the US GPS network, marking a major step in its race for market share in the lucrative sector....

Beidou – named after the Chinese term for the plow or “Big Dipper” constellation – is intended to rival the US’s Global Positioning System (GPS), Russia’s GLONASS and the European Union’s Galileo.

“I think the Beidou-3 system being operational is a big event,” said Jonathan McDowell, an astronomer at the Harvard-Smithsonian Center for Astrophysics.

“This is a big investment from China and makes China independent of US and European systems.”
China started building its global navigation system in the early 1990s to help cars, fishing boats and military tankers navigate using mapping data from the country’s own satellites.

It's been operating at some level since 2018.   I'm not sure how they make money from these services - I presume GPS chip manufacturers pay for access to their particular network.  I notice mobile phone specs do often list the GPS network they can use, but I haven't notice "Beidou" before.   What if I check Huawei phones:

Currently, Huawei mobile devices support the following navigation systems: GPS/AGPS/Glonass/BeiDou/Galileo.

 And this:

On December 27 last year, Ran Chengqi, director of China Satellite Navigation System Management Office and spokesperson of BeiDou Satellite Navigation System, said that 70% of China's smart phones use Beidou system.

So yeah, coming soon to your next mobile phone.

And OK, next question:  if a phone can use any of the different services, how does it pick one to use at any particular time?    Does it look for the first signal from any of the systems it can use and then go with that system?   I just Googled the question, but the answer is not yet clear.

Would be impressive, in an evil overlord sort of way, if the Chinese system allowed them to track anyone whose phone chose to use their network.   Is there already a conspiracy theory based on this? 

Update:  by coincidence, Axios has a short article up about "the looming threats posed by space junk".   It's one of those issues that seems constantly talked about, but with little effective action being taken.