I think that Martina and Chris are brave and wonderful, and have exposed themselves to real risk.
However, I would suggest that the vast majority of tennis fans, both those who attend matches, and those who watch it on TV and are therefore the captive audience for advertisers and sponsors, will be GC on this subject at least.
Do you honestly think that the anime activists put any real money in the pocket of Adidas or Under Armour? Are they buying tickets, or ferrying their kids to tennis coaching? I don’t reckon so.
Tennis is one of the few sports where the women can be just as famous and admired as the men (not paid as much, obvs!), so people who have watched their favourite female tennis stars rise up and battle do not want them humiliated by a mediocre males.
This is where sport May break through where art/ media/ culture cannot. TRAs can shout and scream about JKR and just make stuff up, and be given the column inches for it, but they do not have the clout in the sports media.