I'm interested in starting creating small playgrounds myself.
I think an option for setting a playground's visibility would be a useful feature.
There could be several options like:
public - everyone can access the playground
private - only the owner and invited users can access the playground
not listed - everyone can visit the playground using its link
A feature like this would enable creators of playgrounds to show the playground to friends first, so it could already be improved before making it public.
I understand that a feature like this could undermine the central motive behind tech.io (to make the playgrounds accessible to everyone).
I would like to hear your opinions concerning this suggestion.