@arcanicanis The recommended type is still Proposal, but it is not a hard requirement anymore. Flohmarkt is using Note and I think that makes sense. FEP-0837 shouldn't prohibit this.
That being said, other projects might choose to use attachments. Mitra uses Link attachments that contain references to proposals. For example, my actor object (https://mitra.social/users/silverpill) has this attachment:
{ "href": "https://mitra.social/users/silverpill/proposals/monero:418015bb9ae982a1975da7d79277c270", "name": "MoneroSubscription", "rel": [ "payment", "https://w3id.org/valueflows/Proposal" ], "type": "Link" }The href attribute points to FEP--0837 proposal (or a subscription page, depending on the media type in Accept header).
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