Keycloak with a large scale user base

We are implementing a new cloud system (Native mobile app with API back-end) and would like to know if Keycloak can support large scale user populations (starting from a few hundreds and scaling up to the
100K - 1M range). These users will probably use the API a few times a day at least.

Does anyone have experience with such large scale user bases?

This appears a bit older. Did you get an answer to this in the meantime?