Ultimate place for the non-professional photographers

With 1TB of free storage for the non-commercial use, mostly friendly UI and ability to share its mostly unbeatable.
As a way to improve I might suggest to make an extra step towards lifting non-commercial use restriction for an extra reasonable fee.
Another improvement might be keeping the original filename upon downloading. This alone would make Flickr indispensable as a back up storage.
Hopefully it keeps staying in business for long while.

Queen of Spades 123 about Flickr, v4.2.0