Other than a few people who work for Reddit, basically everyone was blindsided by Reddit doing the API thing with such short notice. There's all of like two people developing Lemmy, one also is responsible for the Jeroba app and I think the lemmy.ml instance, and thousands of people just showed up and started trying to use various instances including having so many people sign up for Lemmy.ml it had stability issues. Apparently Reddit managed to hug itself to death during the Digg Exodus, it's not a big surprise it's happening here too and I think Reddit was a bit bigger than Lemmy when shit hit the fan on the previous platforms. There's some growing pains and some problems to work though, but the big ones like the scrolling thing will likely be solved fairly quickly.