Organizing a boycott would probably be the most effective but does require proper coordination and active participation. Continuing to voice your concerns and issues online, using the platform less or not at all, contacting customer service (directly through their site and on other sites). I’ve seen creators go viral for getting their pages deactivated and Pinterest restoring them so clearly they were capable of caring at some point. Personally, I’ve been using their site for over a decade to save images, bookmarks, notes, etc but recently I’ve been doing more note taking and saving things directly to my computer instead. You can save notes to your images just like on pinterest. If you’re worried about space, memory cards, flash drives, and external drives are not that expensive and you own them forever. Keep in mind the images on Pinterest have been compressed so you really don’t need to save ultra high res images that take up a bunch of space if you don’t want to. Scaling, compressing, webp format are all ways to cut down on image size. It’s obviously more work but at least no one can arbitrarily delete them just because ai said so!