GDPR applies to any company with EU customers, regardless of whether they have a blog or not. This means that if you have customers in the EU, and you process their data in any way, you need to comply with GDPR.
Although some aspects of GDPR may be more complex for blogs than for other companies, it is still important to understand and comply with all of its provisions. This includes ensuring that your data processing practices are consistent with the principles of data minimization and data accuracy, as well as taking appropriate steps to protect the privacy of your users.
Overall, GDPR is a comprehensive set of regulations that will require significant changes in how many companies process user data. However, by understanding and complying with its provisions, you can ensure that your company continues to operate lawfully in the EU.