@Judi846 I often see hosts saying they wish Airbnb would do more to educate customers about how to be good guests, and honestly it makes me wonder if they've ever actually read an Airbnb press release. Why would one expect a boilerplate email in vapid corporate doublespeak to be more effective at communicating hosts' expectations than personalized messages from the hosts themselves?
I have to agree with @Gregory87 most of all here - it's really part of our jobs as hosts to communicate and enforce our own boundaries. Unless you clearly state otherwise, many people will presume (and not irrationally) that everything inside the space they've paid for is available for their use and included in their rental fee. They don't see it as "rummaging" to use whatever they find in an unlocked linen closet - they see all of those fresh clean supplies as part of what they paid for, so from that perspective it makes perfect sense to use them all up.
If you're seeing more of that behavior in the past year than before, you're not alone; I think 2 things are going on here:
1) The pandemic pushed a lot of people who are used to hotels into Airbnb rentals. These guests don't even realize how much they've come to take for granted that they're getting a fresh change of towels every morning - they know an Airbnb is different from a hotel, but old habits are hard to break.
2) The activities that used to lure travelers away from their rooms for most of the day have long been either shut down or made less enjoyable by Covid restrictions, so people are spending more of their time nesting in their house rentals. That means heavier use of utilities and amenities.
Both factors may change over time, but don't hold your breath. Get a lock for that linen closet, and use your words.