GOOGLE ANALYTICS FOR FIREBASE TERMS OF SERVICE
Terms last modified: Oct 1, 2018

Excerpt from: https://firebase.google.com/terms/analytics/

4. Nonexclusive License.

Subject to the terms and conditions of this Agreement, (a) Google
grants You a limited, revocable, non-exclusive, non-sublicensable
license to install, copy and use the SDK solely as necessary for
You to use the Service on Your Apps or Third Parties Apps; and (b)
You may remotely access, view and download Your Reports. You will
not (and You will not allow any third party to) use data labeled
as belonging to a third party in the Service for purposes other
than generating, viewing, and downloading Reports. You will comply
with all applicable laws and regulations and Your agreements with
third parties in Your use of and access to the Documentation,
Software, Service and Reports.