When looking at the TV listings for the show, I noticed that the show only goes up until January 1 of next year and that's it. There are no other listings at all, and it's not there in the timeslots where it usually is.

Is it being removed because of HBO Max, or is it for a different reason?

I just looked at the TV schedule again, and the show is not being removed after all.

The show will still be on E!, but it’s also going to be on USA now as well.

And it is indeed being removed from E! after January 12.