Function shared_by_default 

pub fn shared_by_default(part: &str, config: &Config) -> bool

Whether a device that never chose shares a part: what was shared before parts had switches, everything but notes and papers, and projects as the setting all devices followed then said (share_projects); the spam filter’s table, which every device reads. Never the phones’ messages, newer than the switches: each device shares them once you turn them on there.