With the deployment of the structured mentor list to all Wikipedias, any user at a wiki without an already existing Growth structured mentorship system can sign up to be a mentor. Then this user would be the only mentor available for all newcomers (with the risk of being overwhelmed).
To provide some security with a confirmation step, @Urbanecm_WMF and I agreed on turning mentorship off on all wikis where the community has not yet setup a mentorship list.
Communities with no existing Growth mentorship program will then have to:
- turn mentorship on at Special:EditGrowthConfig
- individually sign up at Special:EnrollAsMentor (through Special:MentorDashboard)