Don't shut groups down!
You first shut down group leaders sharing their own personal files (ex. embroidery) and now you are shutting them down completely. You should be grateful they brought in so much traffic to your site. I am not a group leader but I am a follower. You have now alienated a vast amount of users who (including me) will not be back to your site for any reason ( not even email). You are so ungrateful and selfish toward hardworking people who just want a means to share their wares. Your alternative sites for them to share (Facebook, Google, etc) are jokes and a l lot of people find them too intrusive, so they won't go there. You are no longer a fun place to visit.
Peter Walker commented
we feel the same and setup our own replacement service. https://forums.group
move your groups to groups.io while you can