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I'm seeing lots of spam lately either from domains that have [easytoremembername].com and end up being domains for sale, or, today, a flood of [name of bank].de, which belongs to the bank, but is probably not used by them for email. All without DMARC.
I don't recommend p=reject for actually used domains, but for domains that are *unused for email*, you have no deliverability problem, you want non-deliverability for all mails with that sender.