It would be fair if we'd see an increase in government funding of open source projects. Or at least the government could pay for security audits.
I think you are not familiar with how governments work. They are not going to rely on a random git repo, they are going to have contractors to ensure a basic level of support and bug fixing. And some contractors to ensure development and availability of tooling. And deployment and integration. They are also going to test, audit and validate updates, not just pull from remote. Also, in some cases there are research ag…
That said, Birmingham UK turned a £38 million Oracle Financials project into a £90 million failure after including re-implementation costs. That kind of stuff probably isn't replaceable, simply because they spent all the money.