Wikipedia will keep running, even if you don’t donate. The Wikimedia foundation (which runs Wikipedia) gets a lot of donations and fund a ton of other stuff apart from Wikipedia, so you’re donation will rather have a chance to decide if these keep running.
I, too, don’t love the use of AWS/Cloudflare, while I get that you can simply replace AWS S3 with something else for backups, this server setup is innately based on using Cloudflare.