When I was a kid that was competition.
I’m a fan of using regulation against such entities and behaviors, I’m just unsure what the antitrust or monopoly issue is on short social video clips. You could build something similar with Backblaze, Cloudflare, and mobile apps.
You should either have a plan or try hard to come up with one to prevent that situation, or avoid that market altogether. This is business 101 and is the most frequently asked question when you pitch a VC: "What will you do when Google copies you?"
Also, TikTok won't just die because of Instagram. Instagram failed so many times with their copycat products. Which is exactly my point. The product will win if a large company can't win simply by throwing money at it.