It still economically viable for large governments to make their own for just civilian use, under the same logic that has government funding roads, parks and other public goods.

The GPS system cost ~$12 billion to make, and needs ~$750 million a year in maintenance (mainly launching new stats as they have a service life of 15 years). This means it costs each US taxpayer $5/year to run. Quite a few road/subway projects cost more than the GPS system.