Zyobot
Just a time-traveling robot stranded on Earth.
Removing and altering "racist" lines here and there. Plus a disclaimer in all books, lest anyone think that the publishers condone horrible WrongThink. Can't have that!
Just wait. It'll only get worse. It's like... George Lucas and the "special editions". They'll keep tinkering. More edits every time. And they'll do everything to get the originals out of circulation. If you rely on cloud-based digital editions... they'll edit the versions in your library.
If you love something, buy the original, and buy it second-hand if you can. Because otherwise you're still giving money to the enemy. (Besides, second-hand bookshops should be treasured.)
*Archiving everything intensifies.*
More seriously, while there's certainly something to your advice, I also think this'll incentivize those paying attention to find (often legally grey) ways of preserving the original content. Sure, Big Media will no doubt lobby for the government to start cracking down, but will that stop it? Honestly, I don't know that it will — not to mention how the government and ruling class's priorities are likely to be elsewhere, once the larger geopolitical situation becomes combustible.