ByteDance

TikTok surpassed Google and Facebook as the most popular site on the internet in 2021. Concerns outlined in this podcast from the Center for Humane Tech include influence by the Chinese government, surveillance and algorithmic manipulation, keystroke tracking, addictiveness, and influence over other platforms (eg. YouTube Shorts and Instagram Reels). US Congress and the Federal Trade Commission are investigating TikTok's data practices and corporate governance over concerns that they pose privacy and security risks.
Source: Center for Humane Tech (2022)

In 2019 ByteDance agreed to pay US$5.7 million to settle Federal Trade Commission allegations that the company illegally collected personal information from children. This is the largest civil penalty ever obtained by the Commission in a children's privacy case.
Source: news article (2019)

In 2021 TikTok agreed to pay US$92 million to settle a class action lawsuit over consumer privacy violations in the USA via its current app and its predecessor, Musical.ly. The plaintiffs' allegations included that the app doesn't notify users that its filters and effects use facial scans that capture and store biometric data; that after a user records a video TikTok keeps a copy, even if the user never posts it, and there's no notification that any such transfer occurs; and that the app collects private and personally identifiable information and device data for the purpose of earning revenue through targeted ads. In addition to the payout, TikTok has promised to initiate a new privacy compliance training program to protect users' data.
Source: news article (2021)