This is a good suggestion. For the sustainability of TalkImg's image hosting, there must be a donation button so that those who want to donate and support the website to continue to exist can donate directly via Bitcoin or other coins. Image hosting requires storage that has to be upgraded when the capacity is full and this will continue, as well as maintenance costs and some other support.
For start adding bitcoin address at the page bottom for donation is also fine, but additional donation buttons are welcome addition and they can include more fiat donations, paypal, etc.
That's not good: This domain is owned by Alibaba Cloud. If they decide to change the URL (be it soon or 10 years from now), all embedded images are gone. It also means you have a vendor lock-in: you can't move to a different webhost anymore without losing those images. I'd say change this while it's still early.
I don't like this, but I think many alternatives people are using today for uploading images are doing something similar.
We can't expect joker_josue to use his own hosting and hard drive space for this, but have you tested how imgur, imgbb and others are handling this?
If images are created after embedding them on the forum, it will still create broken image links. The user could just edit their post so the image isn't shown anymore. It's better to have a delete-button that only works for a short time.
All posts and images is archived so changing links is not doing much, but I wanted to delete image from server itself and stop wasting space for hosting useless stuff.
I know saw some image hosting have temporary image upload that gets auto-deleted after set amount of time.
This is not best use case for forum but it can be useful for something else.
I hope to draw on donations and perhaps accept an advertising banner similar to subscription campaigns if any campaign managers are interested. I just haven't mentioned it yet because I thought it was too early to talk about it.
It's always better to do it now than later
Adding donation address on website costs nothing.