What I saw online (take with grain of salt) is UHC has 29,000,000 customers, and a 32% denial rate (the highest in the industry), so that gives us a possible 9,280,000 people denied if there were 1 claim per person a year.
That is obviously super rough guess, cause not every customer makes a claim a year, some may make none and some multiple for the same thing that could repeatedly get denied.
In line and on display to motivate the near-homeless working class to keep going to their three jobs to stay afloat.