Well in my case it was true.
I left three months ago and only occasionaly visit my Nutaku Account.
Not because i immensely disliked the Nutaku Version (like i did back in February 2017) but just because i have better luck on DMM. More freebies there was also a big factor. I couldn't afford to whale on both versions so i quit.
For the Rainbow i went with Hollyhock. Don't have her on DMM so i got her here.