I'm not sure why, I watched the french streamers since the second part of the canva opened and i honestly saw absolutely no streamers talking/using bots. The possible option would be an hidden group of french viewers botting but I highly doubt that because whenever the streamers launched raid on a part of the canvas a large number of people were immediatly reacting (something you can't do with bots since you need a bit of time to code new instructions).

Plus there were some timing were no streamers was giving instructions and people were waiting and not building much (while bots would keep placing tiles continuously).

If you look the timelapse you'll notice that one thing vanish instantly: the BTS violet logo, because of the aggressiveness of their own bots. And overall you see a huge difference of behaviour between spanish bot and french "supposed" bots.

So my theory is that it was a combination of stupid french putting white tiles and spanish/usa opponents willingly putting tiles that made france disappear so quickly, but still weird gotta admit.