It seems to me that it would be stupid to not at least attempt to advertise for Lemmy given the perfect opportunity. Many have expressed concerns about giving reddit more traffic, but a few thousand users is less than a rounding error to reddit. However, getting a few thousand more redditors to move to Lemmy would be great for us.
Hopefully I can get a few sh.itheads to help in this noble endeavor. If not, at least I tried.
If you are thinking of doing this, I am begging you to stop and spend that time contributing to lemmy instead. 10,000 users will be a drop in the bucket for r/place, but 10,000 extra comments or posts could be the difference between the whole site surviving or not.