I strongly disagree. If everyone on Lemmy went to reddit for every second of r/place, that'd barely even make a blip on their engagement numbers. On the other hand, we can potentially grow this platform by quite a lot if we can draw just a bit of attention.
It's a bit silly to turn down an easy opportunity to grow Lemmy as a way to spite Reddit. If you really don't care about reddit anymore, then there is no issue with using it to find people that can help contribute to the growing communities here.