Ok. Here is a Google Maps link to the Yamal Peninsula, the area the "crater" was found. It is filled with these same kind of little ponds:

https://www.google.fi/maps/place/Poluostrov+Yamal,+Jamalo-Ne...

If you somehow would get a hole in the ground, it does not sound that far fetched to me it would get filled with water over time.

And of course other people have noticed this too. It is just, that many times the most vocal ones are the people who have a belief system/agenda to drive. How things really are, is not a matter of an opinion.