>>33865932There is nothing saying an idol cannot collab or associate with men.
It's not rare for them to perform together.
It's not rare for idol producers, manager and ever trainers to be men.
A not insignificant portion of idol fanbases are men and go to meet and greets and such events.
It is not the idol aspect of hololive that is the reason for these "rules" it is the virtual anime girl aspect.
