Why would Starlink give out that info?

Requirement for being allowed to operate in the country?

I remember a Musk quote that countries who want to block Starlink can “wave their fists at the sky”

Elon already gave in to China's demands regarding Starlink

"In May 2022, after shaking hands with then-president Jair Bolsonaro at a luxury resort in the interior of São Paulo, the businessman (Elon Musk) said he was "super excited for the launch of Starlink for 19 thousand disconnected schools in rural areas and environmental monitoring of the Amazon. .. The promise never came to fruition, according to the Ministry of Education and state secretariats."

The new government undid things

Source?

in English too -- https://www.itu.int/hub/2023/11/brazils-new-strategy-aims-fo...

Location doesn't tell you operator. You can guess but you can't be sure