In terms of analysis framing, this may be limited in its actionability since it can be hard to get statistical baselines on your target market. You mostly see TAMs discussed in terms of size, not in terms of the characteristics of their average member

I've got inferential stats on the mind since I've been thinking a lot about experimentation at work, but it does in general make me wonder if this is a part of how growing companies get out in front of their skis.