@cthos @aeva I don't have an answer to this question. I've seen various claimed attempts to ballpark this number, but I expect it will change month to month, so even if I trusted the numbers I saw (I don't) there's no guarantee they're still accurate.
The Big Problem as I see it is since every "tower" contains the entire network, if the amount of traffic on bluesky doubles, the operating costs of each tower doubles. The "oh shit this is harder than I thought" problem is even worse than fedi.