was a 5 year redditor before bailing last month but never paid attention to r/place until now (fascinating!)

can someone familiar with the inner workings of it please explain to me how it logistically works?

like how do they coordinate creating the flags, logos -- most importantly the "fuck spez" messages'.

i believe i read a user can only change one pixel every so often? if true, how is it determined who puts something down, who goes next ...etc.

any light anyone can shed on this would be much appreciated!