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Rust does not have tier 1 support for all the platforms that Linux supports.

You can create NFTs which programmatically collect royalties on each sale [0]. This royalty could be used for continued conservation efforts. I don't know much about programming smart contracts but I think one could be programmed such that if it isn't transferred within a certain period of time it could be burned the next time the user tries to transfer it.

[0] https://rarible.com/create/erc721

Etherum will be PoS in like 2 years.

You can use AltStore to easily sideload apps to your iPhone without a developer account[0]. You only need to be on the same WiFi network as your computer once every 7 days to "refresh" the sideloaded app.

[0] https://altstore.io/

As most grocery stores aren't open 24 hours there is plenty of opportunity for people to break into grocery stores with no one in them and steal but that isn't a common enough issue to worry about.

There can be one person making recommendations remotely for 10 stores. That same person can be sitting in front of an interactive map which allows them to look up the location of items and since there is a a camera in the store they will know where you are in relation to the item to direct you.