It got migrated cause it mentioned RPI. That's all. By the same mod who migrates any question with ***Arduino*** or ***Cars*** in the question as well. Within minutes of being posted. With no one down voting or close voting. Single handedly. Even though we have a don't migrate to betas or don't migrate crap policy. http://meta.electronics.stackexchange.com/questions/3384/migration-guidelines-re-arduinos?rq=1

The only way for this to stop is if users and mods of those sites continue to complain.