I'm confused by your argument that because the service's status may change, it shouldn't be bundled. Couldn't they update to remove Pocket if the service goes away? It's not like Firefox is going to stop development anytime soon.
Pocket is not Facebook. Pocket can go out of business sooner than Facebook will ever go out of business. Including Pocket can actually promote Pocket to get more users, so to some Fx users they suspect there was some money-business deal involved. After all Firefox doesn't bundle Yahoo being the default search in the North America region without Yahoo paying at least what Google was paying.
