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Congrats. You've found the goalpost that can't be reached. A goalpost that no policymaker seriously demands of any of the major companies, including, I'm positive, many of the corporations creating products and services you use all the time. You gave no indication that it was your basis for condemning literally every major platform (something you only began once all other arguments were dismissed), but it's your endpoint. For all that you say it's completely necessary, you certainly didn't start with it, or say it should apply to domestic companies until I pointed out the hypocrisy of demanding it from just TikTok.
This floor of "required to be open-source" we've hit after your different demands and assertions is why I say you give every indication of concluding something and working backwards to justify it as opposed to changing based on evidence. I am pretty sure if I could somehow satisfy this latest condition you'd find yet another reason to hold onto your original belief, and I say that based on the proof of having done so several times today.
All of them should have to publish the code. Let's start with hostile nations and their "news" apps and then work our way up.