You’re asking for an open network and then putting restrictions on individuals right away by saying they can’t use blockchains on it. Some people want to use blockchains (or any other technology) and an open network shouldn’t put restrictions on how people participate.
If what you really want is to change what other people want you will stay disappointed.
Why leave an existing protocol and easy accessibility just for a few images.
Any way I'm not against image galleries and video sites either. I just want control over how I consume those. If I want the page read to me it should be possible. If I want to consume it on a tiny 2x2" e-ink display that should be doable.