Makes sense, yeah. The rule should be clarified though like I mentioned in a later comment, because right now it means you can't link to rainbooru for example. "You may not upload images with a website watermark" may have unintended consequences by banning deviantart watermarks for example, which, while highly undesirable, are often unavoidable.
Also, how will that apply to ironic watermarks? Say if someone ponifies a stock image and slaps SHUTTERSTOCK all over it for authenticity. Or if someone's making an extremely ironic meme and adds an ironic ifunny watermark. Does that count as "original without watermark does not exist" since you, the artist, never made a version without the watermark? (What if you make two versions, one with and one without the watermark?)
I think the rule should be something like "do not upload images that contain image aggregation/reposting website watermarks, unless you're unable to find the original or it does not exist", or something like that.
[bq]
> Of everything you mentioned in "Can I upload it" The answer is yes, but make sure stuff is tagged properly.[/bq]
Oh. So "[1":](https://derpibooru.org/images/1637196), "[2":](https://derpibooru.org/images/1637047), "[3":](https://derpibooru.org/images/1664939), "[4":](https://derpibooru.org/images/1881221), "[5":](https://derpibooru.org/images/2065140) and "[6":](https://derpibooru.org/images/2148230) would all be allowed? Are any of these "over the line", or is every single one allowed?
[bq]
> When it comes to Filly Funtaisa, I'm inclined to say yes[/bq]
Awesome (presumably alongside the other horse cartoons/franchises I mentioned as well)
[bq]
> filters[/bq]
I'd filter "furry" in default as well (can allow it in default+). I would also advocate for a "pony only" filter, which would hide humanised, anthro, original species, and other shit like semi-anthro or satyr (and may or may not hide EqG). This may not be the default filter, some people really appreciate pony-only while others have no strong opinions on anthro, so maybe keep it separate from the default.
I'd also suggest an "Everything++____" filter which would come with a BIG RED disclaimer "this will show you _*everything_*, including loli/shota (and other things that may be hidden from everything), if you proceed you acknowledge that it's legal in your jurisdiction". I get the intention behind hiding them from Everythin*, but I think a sufficient amount of users will be in the US and won't care about seeing loli, and would appreciate having an actual, true Everything without having to jump through hoops and log in or find a public filter ID or something.