I'd think something like have www.centos.org redirect to centos.caosity.org with some prominent 'Return to caosity.org' link. Then have centos.caosity.org have centos specific content.
This seems quite good, if having centos.org as main site is not possible (we should ask this list's users and the Foundation). I'm made a bit the same way as Rocky. I don't want to be disturbed with anything else than what I'm interested on: CentOS. It makes me lose my time, and is confusing. I would rather prefer seeing banners for a little profit for the organisation than seeing infos about something which is almost a competiting OS. It makes me like feeling frustrated to not have the benefits of the other one each time I come on the site.
I think this way: if the user typed: www.centos.org, then he probably wanted to see centOS stuff only.
Another reason: when I first came on this site, I lost quite a lot of time to understand that there were two different OSes and that I didn't need to use Cynch although I had read everything on it, etc.. Keeping centOS stuff on the centOS.org site would be much clearer, and if the Foundation accepts it, then why not doing it ?
Interesting question..
Daniel