The problem DMARC solves is different than the problem the PSL solves, though. DMARC prevents a 3LD from pretending to be a different 3LD on the same 2LD. But the PSL handles things like what it means to make a "cross-site request" or how to handle cookies.
I mean now I'm thinking if DMARC _could_ solve that... but I don't think it could, unless I'm missing some extension or rare use case.
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(That's DMARC, to save others the trouble.)
The problem DMARC solves is different than the problem the PSL solves, though. DMARC prevents a 3LD from pretending to be a different 3LD on the same 2LD. But the PSL handles things like what it means to make a "cross-site request" or how to handle cookies.
I mean now I'm thinking if DMARC _could_ solve that... but I don't think it could, unless I'm missing some extension or rare use case.