I mean, short form video is available on YouTube, Instagram, Snapchat, Twitter, Reddit, Facebook and those are just the ones I know about. How is having one less option impacting someone's ability to speak?

"People use a product to speak therefor the product cannot be regulated" is not a claim I'd heard before the TikTok debate. Seems to contradict previous interpretations of the first amendment that allowed the regulation of cable, TV broadcast, and radio.