Photo illustration of TikTok app logo on a smartphone screen displayed with the American flag.Nurphoto | Nurphoto | Getty ImagesPerplexity AI on Sunday revised the merger proposal it had submitted to TikTok parent ByteDance. The proposal, which would create a new entity combining Perplexity and TikTok U.S., would now also allow for the U.S. government to own up to 50% of the new company upon a future IPO, CNBC has learned.A proposal document viewed by CNBC, which was shared with ByteDance and pr...