I don't disagree with your numbers, but "and then burned in a furnace because no one else wants it" is doing a lot of work.

Why does nobody want it? If it is being burned off because nobody wants it, then it effectively has less value after compressing and delivering it than the natural gas itself (or as you say, they'd be selling it and burning the natural gas instead).

The truth is, you can burn it off and save the cost and trouble of purifying and storing it (which also uses energy and produces carbon), especially when using it in fuel cells requires 99.99% purity. You couldn't just pipe it over to a data center or power plant.

It's worth considering also that not only is the hydrogen that would come out dirtier (because it's being replaced by natural gas), it's also making the natural gas dirtier, because you're burning methane instead of hydrogen to refine it.