I am using
https://imgbb.com/.
This works for me without registration and is always stable. There are multilingual versions and links are provided in different versions. I checked my screenshots from 2018, and they are also still alive and not blocked.
For example:

Can you post the image alone without the embedded link of the image upload on imgbb.com? I'm having problem too on using this image hosting website and I can't post the image here whenever I remove the url attached on the bbcode provided by the imgbb. I just don't link to see a long bbcode when I'm attaching it to my post. Is there a remedy for it?
https://ibb.co/z8QQL4z
No, it doesn't work, if I understand you correctly. But what's the problem with using a ready-made link? Does it somehow deanonymize the user? I never remove the URL, but just paste it into the post.
But you puzzled me, if possible, tell me why you do not use a ready-made link?

The ready-made link is too long than usual which makes me feel uncomfortable when attaching on my post or thread. It giving me a hard time to edit a thread that has image if I use long links since I’m just using mobile device when browsing the forum. I’m ok about giving the source link, it's just my personal preference to use short link on my postings.