Blog hosting sites are increasingly using open source blogging software projects to power their blogs. This trend is likely due to the many benefits of using open source software:
Open source software is generally more reliable and secure than proprietary software, making it a better choice for blog hosting sites.
Since open source projects are constantly being updated and improved, blog hosting sites that use them are likely to have more up-to-date features than those that do not.
Since open source projects are made available under a free and unrestricted license, blog hosting sites that use them can be more transparent about their operations and policies. This makes it easier for readers to understand and trust the site.
Overall, using open source blogging software projects is a good way to improve the reliability, security, feature availability, and transparency of a blog hosting site.