There's > 6 thousand of these labs. I wouldn't really consider that scarce considering the implication.
There are only a few dozen PhDs working the BSL-4+ labs worldwide. And they have state security and state intelligence services constantly monitoring them. The BSL-1 workers (a few thousand like you mention) have access to only much lower risk bio assets/risks.
And the underlying message is that the LLM empowers 8 billion people to do some of what those scarce dozens are doing.