It’s getting more common and personally I hate it as much as you do. There is no way a model can give full attention to someone when they are in multiple different sites
I actually went private with a model a few weeks ago. She welcomed me but seconds later she welcoming people from other sites and laughing and joking with them whilst I was in private. I could hear all the tip sounds going off. It was rude but also quite embarrassing. It seemed like the others were a priority to her and she didn’t care, I just sat in silence and stared at her while she seemed to be having the time of her life and then left when the minimum time was up. She didn’t even ask how I was doing, not one single word after the hi.
I fully understand some models may turn off their other cams but I can only speak for my experience. It’s hurt me money wise but it has hurt my enjoyment of cam sites as I don’t visit as regularly as I did and in fact stopped visiting any cam sites for over a week after this. It’s also made me paranoid, When I came back I now lurk in rooms listening closely for sounds of tips from other sites. I watch every detail of models to see how they act and whether they are looking at another computer before I start tipping. This one bad experience like this has me thinking if I really want to visit cam sites anymore but maybe it’s for the best and my well being