Users leaving the platform is definitely a dent in Facebook's image.

However, I'm pretty sure that at the end of the day if companies start withdrawing their funding for Facebook ads, the platform's shine will drop sharply.

So far apart from Mozilla, there really hasn't been any comment from the corporate side. I suppose it's a bit of the chicken and the egg problem - Fb has a lot of data so companies want targeted advertising and companies paying for it leads Fb to collect data.