SpaceX

As of September, SpaceX have deployed ~7,000 satellites out of a planned ~12,000 for the current constellation. They just passed 4 million subscribers in September as well.

The number of necessary satellites is partly dictated by the number of subscribers in high density areas (max bandwidth) and partly dictated by the surface area of the Earth and the altitude of the orbit (global coverage). Since the Starlink constellation in VLEO, each satellite can service a much smaller region at any given time compared to a GEO satellite. VLEO has other advantages though, such as reduced latency and lower risk of Kessler syndrome.