https://www.vice.com/en_us/article/3az4pb/reels-by-instagram-is-just-a-big-ad-for-tiktok

What is Reels by Instagram? Well it's basically just TikTok, the extremely popular short video sharing app that Trump recently declared a "national emergency" in an executive order. AndI mean that literally: many of the Reels currently hosted on Instagram are just ripped directly from TikTok

Reels by Instagram is Facebook's attempt at stealing TikTok's valor before the latter app is legislated out of existence in the United States amid paranoia about its parent companies, Bytedance. This is Facebook's general approach to competition—to absorb it completely. According to Mark Zuckerberg during last month's congressional hearing, this was part of the motivation for acquiring Instagram at the time, another app it tried to clone before it just bought it. You might also remember Snapchat had a brief moment in the sun as possibly viable social media competitor, until Facebook copied its features with Instagram Stories and crushed its dreams.