I can’t help but wonder if somebody else has had this idea before.
Thundercows
These bioengineered animals were designed to circumvent the high-technology ban that Galactic civilization slaps on trade between advanced and primitive planetary cultures. Said ban is interesting, actually: the primitive planetary cultures hate that ban because they can’t buy cool gadgets from advanced civilizations. The advanced planetary cultures also hate that ban because they can’t sell cool gadgets to primitives. And the Galactic government hates the ban because everybody screams at them over it and the paperwork is sometimes almost literally murderous. And yet, nobody can ever manage to get the relevant laws repealed. It’s either weird, or a conspiracy: take your pick.