I think kbin is more promising than lemmy. The admin seems a good guy, kind and levelheaded. Since a month ago, before the blackout, he build kbin by himself and since then someone even volunteered to help him polishing the site.
The site looks polished but still in beta and they're actively ironing out hundreds bugs and feature request by us users.
Ultimately also the users are nice people. Many of us have donated money and right now the admin have enough money for nearly a year. Source: https://kbin.social/m/kbinMeta/t/177112/kbin-project-management-costs-financing-future-plans
Seriously this - @ernest has done a fucking incredible job. This software is flat-out amazing from a publisher's or author's perspective. It really encourages quality submissions as well, and the community is extremely positive.
Since a month ago, before the blackout, he build kbin by himself
Per that link you gave, ernest started building kbin in January 2021, launched the first instance in September 2021 and started to work on kbin full-time in the end of 2023 (EDIT: 2022, of course; always refreshingly embarrassing to make mistakes when correcting others). Not directly mentioned in that link, but hinted by the graph there, the kbin.social instance launched in April, now close to three months ago.