IMPORTANT
Snaps are installed into the MetaMask instance of each user. If a Snap stores data, that data is specific to that user's MetaMask instance. However, that data can be shared with multiple dapps. Do not assume that data stored by a Snap is unique to your dapp.
On this page: https://docs.metamask.io/snaps-connect-eip-6963/snaps/how-to/connect-to-a-snap/
We have this callout:
It should probably be moved to this page: https://docs.metamask.io/snaps-connect-eip-6963/snaps/features/data-storage/
Most likely to the top of the page.