Antmicro also teased their low-density SoM board [2] last year, but I have not heard any news about that since, which is a shame because you could put a ton of those in a server rack.
[1]: https://www.cnx-software.com/2022/08/29/pine64-star64-sbc-st...
[2]: https://www.cnx-software.com/2021/04/30/antmicro-arvsom-offe...