Small chuuba here who knows a few people. I tuned out of Niji stuff for a long while now, but Sayu coming back into the spotlight reminded me of something.
I was at one of those convention afterparties where industry people would hang out. Vox came with Uki, and coincidentally Sayu was there. I actually didn't know who she was and talked to her for a bit and she seemed like a genuinely nice girl. But as I hopped around from circle to circle I learned that Vox and Uki actively had people spy on her so that they could know her location at all times and avoid her.
I thought they were cool previously, but my impression of them soured very quickly from this.