I'm assuming
@Rezza is speaking specifically about domestic success but I don't know how you'd measure that maybe currency based superchat, which might exist but I'm not sure where. Probably easy enough to script something to pull the data but I can't be bothered.
As far as viewers go only the VTubers themselves have access to their demographic numbers but I guess you could go by chat/comment language % and scale that to total viewership or something to get rough numbers. I know there was a site but I don't think they specifically track ID and I don't think they track non-Holos but I could be wrong.
I wouldn't use Facebook as a perfect indication of domestic engagement but it is a data point and not to be dismissed entirely.
HoloID does lean into the non-ID fanbase quite heavily. Reine is pretty much an EN streamer. Anya recently got a boost when she started tapping into the JP audience. Moona got popular from the general Hololive viewership with her PekoMoon Minecraft shenanigans. A lot of HoloID's success can be attributed to general Hololive viewership, which is why Ollie's numbers took a hit once Council came out and part of her fanbase migrated to girls like Baelz.
If her numbers hold, Kobo does seem to be the first successful ID-leaning Holo.