Bulmer doesn't pay royalties, because he isn't required by law to pay them. When you buy the rights to the music, that means the rights to the royalties.

The demonization of Bulmer is done by people who believe he should, out of the kindness of his heart, pay the royalties to musicians who signed the rights to their music away decades ago, so no longer have a right to be paid royalties.

If a legal case against him could be won, we'd have seen it done by now. It can't, so people whinge about what a bastard he is.

And BTW, I'm not suggesting he isn't a bastard. I'm just saying the whole demonization of Bulmer has been a tempest in a teapot by musicians who weren't savvy enough to hand onto the rights to their music. Which includes a large segment of the folk scene in Britain. Including some who were even warned off Bulmer in advance, but signed it all over to him anyway.

There is no cure for stupidity, as they say.