Most people unfamiliar with the force are skeptical of possession. Most Sith Lords would be shocked to learn that droids can be possessed as well.
Despite the fact that this definitively proves at least some droids have souls, them being a prerequisite for possession magic, it's not likely that this fact will change anything about their unfortunate situation. More specifically, them being slaves.
Though to be fair, it's also legal to have clones as slaves.
Now that I think about it, slavery of any kind seems to be legal in The Empire.
At least The Republic outlawed slavery for "most" people.
Just don't look into it too much.
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