Bitcoin Nodes Downfall

I've been looking at growth of Bitcoin nodes for the past years from 12,000 to almost 20,000 all time high.

Since Germany, Mt Gox and other stuff in past week Bitcoin nodes went from 17,000 to 11,000.

Link here. Https://bitnodes.io and https://bitnodes.io/dashboard/

Also noted most of offline nodes are Tor in main page stated -77% less .onion nodes.

What is happening?