Yes, the data coming from the Matomo (Piwik) API belongs to you and is not covered by the GPL.

You can use Matomo (Piwik) as a service, and reuse, publish, display, modify, process the data coming from the Matomo API using the REST API web services call. See also the GPL FAQ: Is there some way that I can GPL the output people get from use of my program? For example, if my program is used to develop hardware designs, can I require that these designs must be free?

Any questions?

Many answers and more information about Matomo you can find here:

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