So as far as I gather, it’s still just as open source as before but you just can’t sell it on the Confluence marketplace? Seems fair.

Good for them.

The adherence to open source in the form of free labor for corporations is not about freedom or availability whatsoever.

Very confusing title!!

I think they moved from GPL3 to Apache 2 in 2017 and then only added that one line about restricting confluence in August.