Most likely these laser links only go from each satellite to the one ahead and the one behind, in the same orbit. That is good enough. For example, there is an orbit that goes right over New York, London, and Hamburg.

Who wants low latency most is hedge funds. It would be surprising if Starlink did not make anyone who wants it pay through the nose to get traffic one millisecond faster than fiber, 100x that for 2ms, 100x that for 3ms, and on up for longer links. What they would really be buying is not so much getting their own packets N milliseconds ahead of the fiber crowd, which is OK, but rather for their slightly poorer competitors to get packets only N-1 milliseconds ahead, which is super-great.

In fintech, they like to say a microsecond is an eon, a millisecond an eternity. When they can get a millisecond jump on the competition, that can mean millions of dollars every day. So, they will pay it. Gladly.