But does that “etc.” count, for example, if someone adds someone to his trust list?
I'd say yes, because this report
https://bpip.org/TrustLog.
That's only for DT1-users. Changes for others are harder to detect, as you'd need to include each individual user to your Trust list to monitor for changes one at a time. Or use theymos' weekly
Trust data dump, but that only works once a week.