Seemingly "small" investments were enough to strong-arm the NBA and Blizzard into punishing people speaking out for Hong Kong, so it appears it gives them enough.
It has nothing to do with their investment. It was because nbas market share in China is huge. I think you are upset with the NBA here, they chose profits over geopolitics.
Naively I would assume that the worst would be that when such a small investor sells his shares then everybody else has an opportunity to make a cheap offer.