Of course contributions by volunteers are also welcome. However there are very few of those who are consistently contributing (particularly phiresky and sleepless one mentioned in op). And because they have a fulltime job their contributions are much smaller than mine or dessalines’. After the Reddit migration lots of people opened pull requests to implement new features, but most of them were abandoned after noticing how much work it takes to address review comments and actually get the pr merged. So fulltime devs seem very much preferable because they can put their full attention to Lemmy, and get a lot more done.