You see this a lot these days (though I suppose it's just more visible now). Another example is people selling political t-shirts (many offensive or obnoxious) to both sides of a partisan divide.
And I don’t see the other party doing anything equivalent, from giant flags on pickup trucks, to roadside merchandise stalls, to pick up truck convoys that harass and bully other candidates on the road…
I guess the liberal equivalent is driving a Prius or something. Both sides, right..?
Ask anyone about there political merchandise and they will never see it as just "merch" but as a fundamental truth that is pivotal to there way of life they they feel is being threatened. It's much like calling someone's religious garments or iconography just merchandise and is a very closed minded point of view.
Guarantee someone's already selling some Jacked Up Joe merch already.
There's always someone selling merch though, a few years back a rather famous/infamous politician in NZ, Winston Peters, came out of left field to win a by-election in the electorate of Northland that the ruling National party government expected to win easy, the same party that had snubbed his offers to work together.
So people started selling "King in the North" t-shirts with ol Winnie photoshopped onto Jon Snow. I, being honest, nearly bought one, because you had to admire his schtick.
So yeah, there's always merch.
But, AFAIK, at least no-one is selling Joe Biden fan art NFTs yet. It's like a double grift.
And obviously Trump loves the merch far more because he gets a cut.
It’s not quite comparable though - this is deliberately deceiving a market into acquiring a service they didn’t need, which is basically racketeering.