For just ONE Starlink v3 it weighs around 2000kg and right now falcon heavy has an estimated cost per kg of $1,500 dollars so $3,000,000 per unit to orbit and let's say around $1,000,000 for the v3 itself. According to SpaceX each satellite can support 60 Tbsp downlink (I highly doubt this just purely based on the compute required) but assuming that is true that's 60,000 Gbps or 60,000 customers at 1 Gbps. The biggest issue here is that each satellite only lasts for approx. 7 years in LEO before its deorbited vs a fiber link last basically forever