On April 20, 2018, SmugMug acquired Flickr from Verizons Oath and put an end to Flickr 1TB storage plan for free users, these users had until February 5, 2019 to convert to Pro accounts or their photo streams would be reduced to a maximum of 1000 pictures.

Is Flickr shut down?

To sum up some recent events: on April 2018, SmugMug acquired Flickr for an undisclosed amount. My understanding is that it was a do-or-die deal, had they not acquired it, Flickr would be shutdown by now. It was a rescue operation.

Can you see who has viewed your Flickr?

You cant. It wouldnt be an accurate feature either, as individuals that arent even logged in to Flickr can view your public photos. This thread was closed automatically due to a lack of responses over the last month.