1. I've already seen this animation pack in the workshop:
Yes, I make the same animations with minor differences for different models, each model has its own skeleton and transferring animations is not always possible

2. I consider animations to be of low quality:
Animations are designed to cover the background in the first place, no one said that they should be in the center of the frame if they do not suit you. Consider this.

3. The model is old and no one uses it:
I was looking for models and had no idea which one was old and which wasn't. Surely there are people who still use it.

4. Ready-made animations harm the animator:
Yes, I partially agree with you, but I know just a lot of people who can't do it without it, as long as they learn to animate manually, they can use ready-made animations

5. I want to re-upload your animation pack with my own fixes:
Yes, you can do this. I'm not looking for popularity, I want to help the animators.
If it's just reupload of animation pack specify the link, in other cases, if you have improved or added something, you may not specify the link.

6. What about videos and screenshots, can I use them?
Yes, just specify the authorship.