* You don't believe social media companies can become literal or de facto extensions of the countries they are located in.
* You don't believe social media can influence people's beliefs and behaviors.
* You believe the above, but think a government cannot (or should not) regulate companies operating in its jurisdiction for those aforementioned purposes.
* You believe the above, but don't think that it amounts to a serious risk, even theoretically.
* You don't care about any of that, you just like the product.
* You don't care about any of that, you oppose the bill on ideological grounds other than the legislative scope, or civil liberties issues. For example (but not limited to) purely partisan reasons.
* You have issues with the specific provisions or wording of this bill, which override your general agreement that something like it may be legitimate and desirable.
Am I missing any? None are convincing me, personally, except maybe the last one, and I am guessing most people who oppose it have not done a line-by-line parsing of the text of the bill either.