Isn't it usually ridiculously salty? Even more so than regular bacon?

If it's intended to be eaten as bacon, then no...it's cured similarly to bacon. You're thinking of salt pork (made from the same cuts but uncured and preserved with salt).

Not that I'm recommending any of this. I'm mostly vegan and haven't eaten bacon in ~23 years. But, there are very fatty bacons out there, and fatback is usually among the cheapest meats available. Not sure if your local supermarket would have cured fatback bacon, but I grew up in the south where there were ample fatback options.

Find a local butcher. Not just for this, but to enhance every aspect of your carnivorous lifestyle.

Yes. IMO the saltiness is a dealbreaker. Some regular bacons are borderline too salty for me though.

Salt pork is usually used to add flavor to other dishes like beans or greens.

Ah, see, I once made the mistake of purchasing "economy bacon" to save a buck only to find out what you just said.

there was a salty breakfast had that morning.