While you can find examples of companies doing it correctly, it’s also easy to find companies who do not. Also, some update theirs seemingly daily but don’t actually state this. Sure, you can check and see that it was updated “today”, but what if it doesn’t get updated and you don’t know its “typically” updated daily. Again, no date for the next update.
These are all examples of companies who do not explicitly specify when the next update will be: kagi.com/privacy nordvpn.com/security-efforts/ cloudflare.com/transparency/