RIP ImgBB's reliability. You had a good run.

Figured it would be good to have an actual thread listing some anonymous free image hosts. If you know of any others, please feel free to share.

Imgbox
Allows albums. One that I've used before. I recall reports of issues in the past, and I'm not sure how they fare now.

Catbox.moe
Supports 2FA. Allows albums but can't upload directly to them. Gives you a direct link to the image when finished uploading, no need to right-click.

Post Images
Similar to ImgBB UI-wise.

Gifyu
Another ImgBB-like.

Oshi.at
Very anonymous. No account registration possible. No album sorting.