parkrun would collapse without volunteers.
The volunteers help each week because they want to. They help because they believe in the ethos of parkrun. There's a huge amount of work that goes on behind the scenes by run directors (all unpaid) that wouldn't happen if there wasn't a sense of shared common purpose.
If anyone was actually against trans people being accepted at parkrun, they'd just stop volunteering. And then parkrun would fold. As it turns out, plenty of people are happy to continue to volunteer to ensure parkrun continues.
And parkrun decided a long time ago what it was. The saying goes, 'it's a run, not a race.'
Back when parkrun operated in France, results were actually posted alphabetically rather than by times. Given the current discussions on bringing back parkrun to France, who knows, HQ might well finally scrap the rankings in every country.