I know some gooners and asked them about it, since I don't want to potentially come into contact with Cold Pepsi. I also did some research of my own, asking around on certain far-left gooner spaces whether or not they knew anything about the new server, and from that I came up with the top 20 servers (in no particular order) that either federate with spawnism, or have members which have accounts in both spawnism and the other servers that they're known to frequent. I'll name those servers below:
1. pawoo.net
2. cunny.beauty
3. ghetti.monster
4. milker.cafe
5. cubsex.org
6. junipurge.de
7. doll.salon
8. baraag.net
9. mapsupport.de
10. fstube.net
11. feral.bond
12. dill.burggit.moe
13. rape.pet
14. izz.bad.mn
15. youthlibrary.casa
16. cottoncandy.cafe
17. mesugaki.xyz
18. yiffy.pet
19. social.zooey.cat
20. vampires.pet
There are currently only 22 users that are registered on spawnism, but upwards of 30+ users that were spoken with today claim to be on some kind of a registration waiting list from what I understand. I don't know whether or not that means that there's some form of enhanced verification that users need to undergo to be accepted, or whether the admin simply hasn't gotten around to accepting everyone, but either way the growth of the server isn't anything good. I also couldn't dig up anything on the admin themselves, so that was a bust despite the effort.
The izz.bad.mn and feral.bond servers in particular were noted for their hosting of illegal materials including everything up to actual CSAM and even animal abuse by the gooners that I've spoken with. The former tends to be online in sporadic instances, while the latter normally doesn't see any downtime, though membership is known to be invite-only. They're two of five total servers that are supposedly federating with spawnism directly according to the assholes I talked to. The other three are dill.burggit.moe, rape.pet and youthlibrary.casa.