It's important to differentiate worries here.

Issue #1: The platform owner itself uses the platform algorithm(s) to manipulate public opinion

Issue #2: Third parties use the platform to manipulate public opinion (e.g. Romania)

#1 could be solved by algorithmic transparency.

#2 could be solved by more realtime transparency into content.

People not associated with the app developer publishing material on TikTok to influence elections works just as well on YouTube Shorts and Reels.