The rf do not usually comment. They haven't commented on the absolute shower of shite which descended on Katie's head over the last 6 months - talk about being treated appallingly. What's the point in commenting? It doesn't help. In fact it usually makes things a whole lot worse, opens up a 'tit for tat'.
Prince William did the same as Harry, when Kate, his then girlfriend, was hounded to the point of tears by paparazzi, issuing a formal statement.
When Harry asked press to leave Meghan alone at the start of their relationship he was supported in his statement by William.
The RF recognise there is no point in issuing statements, especially in the current climate of fake news, social media lies etc.
Meghan was given unprecedented courtesies by the rf - literally showing how she was part of the family even before the wedding. Much better to show rather than issuing pointless press statements that don't change a thing.