Some Decepticons in Robots in Disguise (2015) are just so dumb, I doubt that they would have the intelligence required to pick a side between Autobots and Decepticons. It wouldn’t surprise me if the canon, in-universe explanation for them being part of Megatron’s army was that their friends just slapped a Decepticon symbol on them to prevent them from being killed by others when the war started.

“Filch? Yes she only screeches about shiny things but she’s *puts Decepticon magnet on her* totally one of us! All hail Megatron!”

“Springload? You can see that he already wears the insignia! I had to tell him that it will help him reach that thing he keeps talking about, but he’s totally convinced of our cause!“