> Will there be a mechanism to control account creation and what will be required to be “approved”?

It's probably a good idea to require a known schemer to make accounts
for new people. There could be a thread on the schemeorg mailing list
where people who want an account could write a brief mail to introduce
themselves (perhaps giving a link to Scheme code they have written
elsewhere so that people know they care about Scheme, or if they know an
existing schemer from some project, that could be stated).

A similar problem exists with so-called pastebin sites, which are widely
known to be abuse magnets unless they require a login. We decided
against making paste.scheme.org for that reason. A git hosting site is
not as prone to abuse, but the potential is still there. Perhaps we
could even make a pastebin subdomain if it requires accounts made by
similar criteria.

Do SourceHut and/or GitLab have a pastebin-like feature? GitHub has
gist.github.com which is a good implementation of the concept.