Imgur is a strong host in my book; long lasted, simple, and importantly (playing back to my first bit). Alternatives like google drive and discord I've taken to for being extremely simple and seemingly quite reliable, though I don't truly trust them. Hosting locally on-site as much as possible is usually the most advisable option, but the friendliness of those options here leave something to be desired. But, if you want to finagle with TWC, it's in theory the most reliable option.
In practice we can only hope history doesn't repeat itself and leave things worse off.
Images disappearing is a leading cause of AARs and scriptorium entries losing value over time. I can only advise in relation to the above that you are best suited keeping up with backups and alternative sources. Not much to be done to backdate your AARs so those backups come in handy, but even for more 'handy' things like a signature it's good to keep up. Eliminating text from AARs altogether would be overkill, but there is strong merit to not making an AAR that is going to fall apart without pictures for context.