Servers cost money, and BeWelcome are transparent about that. Having developers to code the site and moderate the forum would be expensive if paid by the hour, but there are willing volunteers. Asking for donations is acceptable, a paywall demanding a subscription is not.
Please come over to the BeWelcome forums; I'd like to discuss the possibilities of starting new meetups, and selling merch (t-shirts, hoodies, stickers) to improve the BeWelcome brand so it can bring together the community, lest we scatter. Any financial donation like that should be discussed democratically though, so that's why your input is needed.
(I didn't downvote, I think your comment is fair)