If Hunts are as difficult as they're believed to be, players later in the week would be SoL if you could only do one per week. I guess SE learned at least a tidbit from coil groups, that if people can't help their friends when they need help, it doesn't benefit the community as much. In this case, it would be first come first serve. Get your Hunts done early in the week or risk not doing them at all.

At least they made it so you can help each other, and also get some compensation for it (invariably leading to minimal rewards/high token costs, but still.... it's something)