Sure, for the 1 person joining, but surely it balances out by doubling up pet rescues for the other 29, especially if you take turns? Moreover, since it’s a rolling thing, could the 1 person joining not have already completed that rescue, left and then rejoined, to then go and trigger a new one with no loss?
If you look at the top post, the bug report is about somehow being able to collect two different pets at the end of a single rescue.