My assumption is that people are able to very easily saturate Pro with Claude Code and therefore even though the quotas are lower (more than proportionally) the utilization of those quotas is higher enough that Pro is less profitable.
Of course, I don't have real insight into available compute, but the vibe slope seems to have dropped a bit, at the same time as new GPUs are being shoved into datacenters as fast as possible.
Loss of customers is the wrong direction
They really don't need to subsidize unprofitable customers at this point when there is a line out the door to pay thousands of dollars a month per user, that are revolting because they aren't actually being able to get reliable uptime.
They have all the growth they need for now, they really don't need the cheap users.