A couple of potential routes to get an official answer:

• SEPTA_SOCIAL on Twitter
• Report this via the SEPTA Transit Watch app

Might also be worth raising to whatever councilperson's district the stations are in. I'm personally torn as I could 100% see this as the result of some dipshit contractor putting tape up before painting/cleaning and forgetting to take it back down, but it could also be some slightly more enterprising low-level criminals. Either way it shouldn't be allowed to stay.