From my understanding the plugins on wordpress.org should be licensed under GPL, right? Or at least follow the WP requirements.
If so, how com many plugins have "restriction" (which by GPL should not) like: wordpress.org/extend/plugins/free-translation
"If the hyperlink to http://www.appliedlanguage.com is removed the
free translation service will be deactivated."
And this is what WP DEV FAQ says:
"The plugin must not embed external links on the public site (like a "powered by" link) without explicitly asking the user's permission."