most successful system resources are made by pro-endos or are endo-neutral for 2 main reasons
people with severe childhood trauma are less likely to have access to the means and stability required to maintain system resources for a wider community. how can you maintain an alter-tracking app or run a support group when your priorities are escaping abuse, stabilizing your life, coping with trauma, etc? especially when trauma survivors are more likely to be in poverty. a system that formed without trauma exists at a point of privilege, as they are generally less likely to be in an ongoing stressful situation that would prohibit maintaining these resources. anyone who brags of how "pro endos are running the most prolific system/plural supports so its pointless to be anti endo" is effectively bragging about how endogenics are better than ppl with cdds because they lack trauma.
widespread anti endo resources get harassed into shutting down (see systemtime) or pressured and blacklisted into declaring themselves endo neutral (see octocon). anti endo resources are forced into being localized, smaller, and not publicly talked about bc its been years and the pro endo community still has a massive problem of violently demanding that anti endos surrender their resources (and security- see pluralkits ongoing privacy issues!) to them.