It's not about whether it's "in their right" or not. The content of the chain is not arbitrary or something that is divine as long as its natural and pays a fee. Ultimately this is software and an open, adversarial network that needs to be robust. DoS and spam are the ultimate issue of all open networks.

If someone figured out a way to make 1,000,000 unspendable UTXOs in a single transaction or just a handful of blocks are were happily willing to pay those fees while creating a huge, immediate jump in the amount of RAM every node had to have to stay in sync, despite not a single one of them having any monetary use or relation whatsoever, would you consider that "valid" and perfectly fine? If you did, then I would argue that you and I disagree on both the purpose and engineering concerns of the network.

Bitcoin is like a giant, trustless clock, that has no alternative. To stamp a bunch of bullshit images and shitcoins into it is like grabbing a precious time keeping device and using it to hammer a nail. Its dumb, doesn't even work very well, and is directly at odds with why the device is so valuable in the first place. This is *not* about who is willing to pay a fee, this is about the purpose of the network and whether the bloat of data is at odds with the very fundamental value that #Bitcoin provides. This is about the tragedy of the commons putting costs on those who maintain the network, by people who don't even give a shit about the value that the network provides.