There are many reason why there should be a flag that isn’t specifically associated to any existing nation state. May it be that on has double nationality, can’t decide if one want to cycle for the country you are living in, or the you are born or the country whose team you want to support. One might not even want to cycle under any nation at all.
Going for country flag means deciding against other countries.
What about an inclusive flag, dedicated to an universal spirit.
My proposal would be to invent a flag which is not associated to any existing country.
What about a Watopia flag (with a wheel in the center) or -as a more realistic version- an UN flag?