Bitbucket is keeping a free tier for self-hosted CI runners
atlassian.com
atlassian.com
this means that you get 1 or 2 concurrent builds for free, rest you pay for. No matter how many "free" runners they let you configure.
edit: apparently they have as well
> In December 2025, we announced our intention to introduce pricing for self-hosted runners so we could provide stronger support and keep investing in new features and ongoing improvements.
I assume this is their pipelines thing. We only use the webhooks to trigger self-hosted CI.