Despite the controversy with its personal data leakage, TikTok has been massively successful and put the established players like Facebook, Twitter and even YouTube on alert. Competition forces companies to improve and just as we need Android to hold iOS accountable, etc TikTok is a good counterbalance to Facebook.
Another dimension is that the tech space is either dominated by U.S. companies or regionally segmented (e.g. Whatsapp in Europe, Wechat in China). TikTok was exciting as a non-U.S. product that grew viral globally. If ByteDance is forced to sell to a U.S. company, then it's back to the status quo.