Just pointing out the facts.
Good point about ownership.
As far as I know, they operate under Orthodox rabbinic supervision as to their physical design, hours, etc. This would seem to be almost exactly will be happening in Israel - kosher mikvehs available for questionable halachic use. I believe the Reform used to use swimming pools and such.
In Israel, such practices are much more politically charged than they are here: Government rabbis vs. Agudath rabbis, etc.
From the article, “Today, Mayyim Hayyim operates under Orthodox rabbinic supervision...”