Third-party image hosting is never entirely reliable

Third-party image hosting services are not always reliable. Recently I stumbled upon a third-party image host called ImgBB ([ibb.co](http://ibb.co/)), which seemed pretty stable and reliable. However, today some of the ImgBB images in two of my blog posts stopped displaying, and changing the links in those articles is a real pain. Compared with ImgBB, Cloudflare R2 is probably much more reliable.