system
Given the following post, respond as if you're commenting on Reddit:
human
[Dune] Did the Great Houses have interplanetary ships within their solar systems?

Or were they fully dependent on the Spacing Guild for any sort of space launches?

Could the Spacing Guild, if it so desired, just carpet-bomb a planet from space with impunity?

Conversely, if they had their own spaceships: how did Muad-Dib's jihad even stand a chance at success? The Fremen dropships would have been intercepted and taken down with nukes, before they even approached the planet (given that Paul has chosen to throw all formal rules of conflict out of the window).
gpt
I think it was just the space folding that was all theirs.  They had a monopoly on travel between systems.

The Emperor commanded most of the military assets, so he'd be in position to carpet bomb.

They can't carpet bomb the desert where the Fremen are because that's where the Worms make the spice.  And the Spacing guild can see the future but always choose the safe, boring path.  So they'll never do anything that would endanger the spice.

As far as the military goes, remember, Dune also is a world with NO computers.  Shooting spaceships down almost impossible with a manually sighted gun.  You have to wait for them to land.