It seems like it would be useful to include acquisitions too, since that's the other side of the same coin and those numbers can be absolutely massive too...

I have a consulting firm that finds VC and angel investment for startups, mostly tech and energy, and around a decade ago was working for a finance firm doing similar work... A decade ago when you asked "what is your 'everything worked out perfectly' hope for where this company will be in 5-10 years" you would almost always get "successful IPO". These days when I ask the same question I get a lot more "get bought by titan of the industry company X or Y". Not like nobody wants IPOs anymore by any means, but a lot of people would prefer to sell to Google or Tesla or someone with a favorable deal and an honorary seat at the table afterwards instead of going public.