Earlier quoted context omitted.
Trello boards export to JSON, would you consider it open? OneNote notebooks are also an open and well-documented specification, as well as local first and backed by a very reliable company, which makes them just as open as Obsidian by those standards. https://learn.microsoft.com/en-us/openspecs/office_file_form...
OneNote and this canvas format might be equally open and interoperable, but it's a hard claim to justify that onenote notebooks are as open as a folder of mostly standard markdown (the two exceptions being wikilinks and embeds)
I peeked at the onenote format standard [1] and the obsidian canvas standard. The difference is hilarious. The onenote standard is painfully complex, provided as a .pdf, and binary to boot. Compare to an example obsidian canvas - this is obvious, text-based (I could read it with notepad++) and easy to understand just by reading it:
{
"nodes":[
{"id":"6c711bf8c24c4f5b","x":-226,"y":-62,"width":400,"height":400,"type":"file","file":"testin/2022-10-14.md"},
{"id":"4dd7d04cdd0b379c","x":-530,"y":-209,"width":250,"height":60,"type":"text","text":"this is a note"}
],
"edges":[
{"id":"0c589a4d6bbb06aa","fromNode":"4dd7d04cdd0b379c","fromSide":"bottom","toNode":"6c711bf8c24c4f5b","toSide":"left"},
{"id":"eda9f3edb3ec232a","fromNode":"6c711bf8c24c4f5b","fromSide":"top","toNode":"4dd7d04cdd0b379c","toSide":"right"},
{"id":"abf404722ba48c3b","fromNode":"4dd7d04cdd0b379c","fromSide":"top","toNode":"6c711bf8c24c4f5b","toSide":"right"}
]
}