CVE program faces swift end after DHS fails to renew contract 1 year ago
It was to the advantage of the US and allies to coordinate and lead in tracking and fixing such errors.
From what I understand of the article, none of these allies were funding it.
Multiple countries, companies, and individuals contributed finding and fixing bugs.
Clearly that itself isn't enough. Someone has to pay for maintaining this service. It appears that no one other than USA spent money in funding it.