What do you think happens when Riedran patrols foray into Adar’s borders, spend the night and don’t have ‘The Dream’?!
Is it a big source of defection? Do Inspired travel with them to keep ‘hold’ of them?!
Riedran sailors and traders don’t have the united dreams either. They are warned about this in advance and know to expect it; they believe that it is the work of altavars (fiends) trying to corrupt them. So they are “free dreams” as a threat, not a gift.

— Keith Baker (@HellcowKeith) August 9, 2020

So no, it’s not a big source of defections; on the contrary, it usually strengthens their belief in the Inspired, who can shield them against this nightly madness and fiendish influence. They pity people who have never known the comfort of the shared dream.
This is different from the Unchained Dreamers, who CHOOSE to dream freely and see it as an escape.

— Keith Baker (@HellcowKeith) August 9, 2020