I'm not sure there's a lot of fear of GPLv3 out there. Linus just didn't want to adopt it for Linux.

AGPL is a different matter because companies are unsure of the boundaries between their own proprietary code and any AGPL code they're using.

Companies that make physical products are afraid of GPLv3 because of the anti-tivoization clause. Cloud companies aren't, but they're afraid of the AGPLv3, because of the anti-cloud-tivoization clause.