Now more than ever is when we need sites like this. This all plays right into the government's hands. They may as well keep it up because people are self-censoring and that makes their jobs easier.
If one person does it, it's self-censorship. If a group of people do it's a non-violent collective action protest.
Continuing the site would benefit the "protest" infinitely more. And the operators probably know this on some level.
And that's the real story here -
These sites are shutting down because 1) it was unprofitable, 2) it was a time-sink, and 3) now there is an excuse to get out and move on with their lives and businesses.
*I'm not blaming them - and I'm not saying it's anything above the subconscious level. I'd probably do the same.