Unpopular opinion, the problem with people solely thinking of the censorship of Ao3 and shipping discourse whenever serious government censorship happens is because, at the fundamental level, they are not getting the full picture.
If you only think of *your* enjoyment of a niche genre of fiction and a niche internet subculture, then you will not understand the gravity of the situation, and that will hinder your ability to act.
If Ao3 is affected by censorship laws, then that is because it was collateral, it was standing in the gunfire but was not the actual target. A government will not think of niche hobbies like fanfiction creation and online subcultures until it feels comfortable enough with the control it has to do so.
When the Online Safety Act was passed in the UK, they were not thinking of Ao3, they were thinking of very accessible information on Wikipedia, the Internet Archive, and many more. Why was this done? It's because the government is actively attempting to censor discussions of war crimes, atrocities, genocide, and abuse of all forms. Ao3 just happened to fit in that category because it's a wide net they cast.
To add to that, they are specifically doing this to make a list of people who say things the government does not approve of online. Ao3 was affected by this, but that does not mean it should be the only priority.
The government will not think of shipping discourse when it makes its laws. Do you know what it will think of? It will think that all representation of the lgbt community is perverted and should be eliminated. And Ao3 just happens to be in, again, the crossfire.
There is nothing wrong with being enraged that you're being cut off from the content that you, as a person, want to consume, but remember all censorship goes beyond your lens of consumption.
If you really want to combat censorship, then you need to stop thinking of just weird fanfiction, and actually research the censorship that has become sweeping as the far right takes more control over government institutions.
If Ao3 is being affected, then there is a bigger problem because the government either does not think of fandom at all or does so when it feels like it has the standing to micromanage people after it already gained control over media and information as a whole.