The problem is that the GPL willingly refuses to permit advertizing clauses. Is there a congent argument about why an advertizing clause is a limitation of freedom?
The GPL doesn't specifically set out to prevent advertising clauses. It is a side-effect of being incompatible with "other restrictions" - for example, a requirement that you license some third party software or patent in order to redistribute GPL-covered code. Instead of trying to specifically enumerate and disallow all such restrictions that someone might come up with, which is a fool's errand, the GPL disallows any other restrictions.
As a minor quibble, section 7 of GPLv3 allows a few other restrictions. That is, there's a general blacklist, as you say, with a specific whitelist of what additional restrictions are allowed.
For example, "b) Requiring preservation of specified reasonable legal notices or author attributions in that material or in the Appropriate Legal Notices displayed by works containing it;"
The GPL doesn't specifically set out to prevent advertising clauses. It is a side-effect of being incompatible with "other restrictions" - for example, a requirement that you license some third party software or patent in order to redistribute GPL-covered code. Instead of trying to specifically enumerate and disallow all such restrictions that someone might come up with, which is a fool's errand, the GPL disallows any other restrictions.