A friend streams on multiple sites. Sometimes she will turn off all other streams when taking a private, and sometimes she leaves all the others broadcasting - probably depending on what she knows/suspects the private will involve, and last for.
Some guys cannot tell that they are watching another's private on a different site - despite the on-screen activity, tip noises, and her dialog (use of name!) usually giving it away.
When they tip, and in particular tip for menu items, she often has to work extremely hard to acknowledge the tipper, or work the tip menu item into the private, without giving much away to the viewer in private.
But she is very good at her job, and I totally admire how well she handles accommodating all this as a professional.
Related - a viewer on CB recently tipped her 1 token ten times in succession as she reached a finale, and then went on to boast in chat about how he had made all that happen.