I'll be honest: I've never heard of Shadowverse before. Is it really that big?
It was/is huge in Japan, I dont keep up with it anymore but it was definitely a cash cow when I was playing it.
Cygames had a truly horrid design philosophy with it (all matches must end in 5 min or less cause mobile) which they publicly announced would change after everyone hated a particularly over the top OP expansion, but I left in disgust and never looked back so I don't know if it got better.
Last I heard it was very expensive to keep up with the standard format so who knows how it's doing now.