Remove serene from snowflake.git commit access?

The current set of users able to commit to /pluggable-transports/snowflake.git is (according to comment:2:ticket:30044):

serene arlo dcf ahf cohosh phw

serene hasn't committed since March 2017 (git log --author serene). Should we remove that account's access?

I'm making this ticket for possible discussion before opening a "Services - git" ticket.

Related ticket regarding bridge admin access: legacy/trac#30138 (moved).