One calendar link for all your calendars
Connect the Google accounts you use, pick which of their calendars go into a virtual calendar, and hand out a single link that anyone can subscribe to in their own calendar app.
Connect accounts
Personal, work, side project: each Google account connects once, read-only.
Build virtual calendars
Each one merges the calendars you choose. Per source you decide full details or busy only, and which events to keep.
Share links
Create one link or several, for example full details and busy-only. Revoke a link and only that one stops working.