Speaking generally, there's an undermarketed positive privacy aspect to such voice changers, in helping with both protecting a user's identity against data scraping and doxxing. Additionally, like one other comment touched on, some people have strong accents that make communication in videos challenging (and can be a turn off for audiences and prejudice initial impressions).

Though by using an online service approach it means providing one's real voice to a service that may be using it for further training. Users have to make the call whether they feel they're good stewards.

All technology can be used for good and evil

If humanity can figure out how to make machines think, may we should also figure out how to stop doing evil to each other

Yes, but we can't stop it.