Yes the thing about itch.io is that unlike Steam, creators are giving a lot of leeway of whether the game can be claimed or simply downloaded. On Steam, most of the F2P or purely free games can be claimed and attached to your account. Here, many products are purely download only if they are listed as free. That brings about confusion about ownership as well (as users believe that downloading a game places the game in their itch.io library). I don't know whether activating the claim option for a product is not always allowed for creators, but that could be worth clarifying by itch.io admins as well.