I dont think everyone would charge. I think everyone who currently runs ads would charge but there would still be purists who host without ads and without micro transactions. It would still cost to implement the processing on your website and simple sites would not want to do this. It might lower the barrier to donation so sites funded by donation could receive more donations but still keep it optional.

Internet archive is not funded on donations from viewers. Its funded off government grants and corporate donations. individual donations make up a tiny %. Micropayments would make Internet archive less reliant on charity from government and corporations and it would not impact peoples ability to spin up a mirror. people can already spin up a mirror but its expensive and would remain expensive.

Anna's archive is whale pricing, a tiny % of people are willing to pay that $5 and the hope is that they subsize costs for the rest of users. I hate this type of monetization and will always oppose it as its highly risky and unfair.