Pro License should not be given to all the users, this should be restricted. Please take back the roll out that happened on 1st June 2017. It affected many users.
What is the impact do you find until now?
Beginning on June 1, 2017, all eligible users will be able to opt-in to the Extended Pro Trial for the Power BI service. And there are restrictions as below. They are not given the pro license but just pro trial for 12 months. I don't think this will be rolled back.
Your account must meet the following requirements in order to be eligible for the Extended Pro Trial offer.
Users that have licenses assigned from the Power BI Pro or Power BI Pro Trial subscriptions, within Office 365, are excluded from this offer.