Board Thread:General Discussion/@comment-30861564-20170905013018/@comment-32354545-20170905015046

Small, inactive wikis are automatically removed.

If they are below a certain threshold, which is not specified, of pages and content and activity, yes, they are removed by a bot. Else, they are left for adoption. It is more convenient to create one's own wiki than to wait for the slow adoption process, that is true. But that is a question of how far should the bot's parameters extend?