I wonder about the effort and budget put into them. Bushiroad has a fujoshi version of Bang Dream, and while it is definitely Bang Dream with guys, there clearly are shortcomings when compared to the "main" version.
Ubisoft Mobile clearly has "try different things and see how it does" mindset right now, lots of very different projects being worked on, canned, published which is kind of normal since they haven't quite mastered how to do mobile games on the western market so most of the cost is R&D looking at tools, prototyping different things before going into a short full dev cycle (though I've heard they're working on their biggest project yet, in a genre which, I assume, is totally unrelated to what we're discussing)
City of Love uses live2d for example which is a fun trivia and shows they knew their target audience and looked at how Japan were doing things back then.