[foxyv]

A single Falcon 9 can carry 37,000lbs to low earth orbit. Falcon Heavy carries roughly twice that mass. Each starlink satellite weighs 500lbs. A single Falcon 9 can carry the weight of 70 or so satellites. However they can only fit like ~60 in the fairing which is the same one they use for Falcon Heavy. Falcon Heavy makes more sense when you need to get similar masses to farther locations (Geostationary, Moon, Mars) or denser payloads to low earth orbit.

[shivaas]

Interesting. I assumed that they would develop a bigger fairing but I guess they did the match and figured out the optimal size based on demand for payload size/weight