It's definitely worth buying used wherever possible, and to repair electronics whenever possible to avoid unnecessary consumption (part of why Right to Repair is so important). Similarly, it's quite beneficial to switch to plant-based meats to avoid both unnecessary animal suffering and the carbon emissions and resource wastage that goes with industrial animal production (especially as those resources become more and more scarce due to poor crop yields and drought from climate change).

It's often not possible to do either of those things 100%, such as it not being possible to be completely vegan/vegetarian due to a family member that isn't on board with it, but it's still beneficial to do what they can, even if it's only 20, 30, or 50%.

Corporate AI usage, on the other hand, is one of those things that truly is completely avoidable with virtually no effort, and was something we all got along fine without just a few years ago. There are even more ethical self-hosted or decentralized non-corporate alternatives.

Someone deciding to ignore the harmful externalities of corporate AI is making a choice to prioritize their own convenience over helping prevent our planet from becoming extremely unpleasant for billions of people and animals to live on, or the financing of a fascist surveillance state.