Feels very ill thought out. They're not putting Mumsnet behind a paywall like Disney +/Netflix, but attempting to charge for a few minor features that people have been asking for for years! They've always held out on making these changes, then all of a sudden what to charge for them. Tut tut!
They would have done better going down a Guardian supporter type approach. The site isn't going to go, as ultimately they need the mass numbers to drive the advertising revenue that is there for the taking.
They ultimately need to carry on going and cut their cloth. Keep the site going with minimal staff and furlough the rest of their staff until life returns to normal. I really can't see that their staff operation is that large, other than AIBU voting, I've not seen a web/app feature enhancements for years.