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They are just advertisements/solications for their credit card products so basically junkmail with your rebuilding project if it's for AMEX and similar cards.
Mail offers are good in the sense sometimes they are targeted and you will get a better than published SUB.
They are not necessarily preapprovals though.
If it says pre-approved and nothing has changed on your reports significantly since they sent you that offer, you'll be approved. Pre-qualified means nothing.