Charlie Funk wrote:
per Holland America corporate policy in Seattle (my paraphrase) about 6-7
weeks ago they can no longer host and publicize such gatherings.

If they had ANYTHING anywhere about "Friends of Bill W" meetings or
gatherings, the corporate policy would seem, on the surface, to be
discriminatory.

It is discrimination, but not an illegal discrimination.
As long as they don't violate the law, they can choose to permit (or
deny) the posting of meetings for whatever group they wish.