I think bluesky posts have always been private, at least while they are in invite-only mode. Here's what the linked skeet says:
> Our systems are currently experiencing some degraded performance as a result of record-high traffic. You may notice some slowness in-app as a result. Our team is working to resolve this issue.
> You can view our system performance status here: status.bsky.app
> Our systems are currently experiencing some degraded performance as a result of record-high traffic. You may notice some slowness in-app as a result. Our team is working to resolve this issue.
> You can view our system performance status here: status.bsky.app