To me, an indoor fleche is practically equivalent to doing a 24-hour challenge, but with a group, and finishing at the same point together. A 24h indoor session is already no joke by itself, but then coordinating it with several others whom are potentially not even living in the same state and/or country? That's pretty amazing.
And in France their lockdown sounds pretty strict, so that they can still get to do an indoor fleche together is great for them:
https://www.thelocal.fr/20200324/exp...onavirus-rules