I am guessing the manufacturer is covering their bases. It is basically a bacterial culture. So, there is no way to be sure that it won’t cause an infection in, let’s say, an immunocompromised person. The risk of inhaling it increases when used indoors. They are probably just trying to avoid a potential lawsuit.
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When it comes to pesticides and the like everyone is different, so I can only speak for myself. I worked five years in the mosquito control field and was around Bti (VectoBac) daily. Easily the most low-impact, target specific, IPM-friendly product we used. I would have no issue using it, responsibly, indoors.
Just my two cents.
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