I don't even do a fanservice thing and I still get people (usually guys) making offhanded sexual remarks. I've had people send me gifts in games I play with messages like, "Just busted all over". I've banned people for overly sexual messages. I don't like it, it's not fun.
Male Vtubers could definitely be super successful.
I mean just look at BTS or Love and Deepspace, girlies do NOT mess around for their male idols.
Hate to say it but... Fan service is really important for both girls and guys, there's a reason why abs get a lot of views