*Emphasis mine*
It's very common that victims of sexual assault or other forms of sexual misconduct don't report it. There are many reasons. Embarrassment, shame, humiliation, fear of retaliation, social stigma, fear that they won't believed, fear that the authorities won't do anything about it anyway, fear that they'll be labeled a slut, fear that people will think that it was kind of their fault anyway due to how they were dressed or whatever (in other words, victim blaming and/or shaming), fear that some people believe that if a woman is a massage therapist then she must be of questionable moral character anyway, etc.
Then there's the fact that these types of crimes are very difficult to investigate or prove in a court of law. From a quick Google search,
As far as why report it now? Who knows? Maybe they found out it happened to other women too and it made them feel empowered enough to speak up now that they know they aren't alone? Maybe they feel like people might actually believe them now that they aren't alone? I really don't know, but just because you or I don't know doesn't mean they don't have a valid reason.
And to be clear, I have no ideal if these particular allegations are true or not and I'm not throwing Tucker under the bus here. I'm just commenting on the more general subject of why women don't report these kinds of things.