> presents a challenge to the business model of freemium services Only if your freemium business-model is based on selling user data. The GDPR is not concerned

> presents a challenge to the business model of freemium services Only if your freemium business-model is based on selling user data. The GDPR is not concerned with microtransactions or lootbox gambling - and you can even run targeted advertisements to your users, all provided you don't try to make an extra $4/yr by exporting the data you've gathered (i.e. it is your own first-party ad targeting logic, not third-party ad targeting).