Firstly this is complex, it depends on what plans and tiers you have, your resell partner, and what region you are in. But the basics each user gets their own

Firstly this is complex, it depends on what plans and tiers you have, your resell partner, and what region you are in. But the basics each user gets their own quota of 1 to 5tb,then there is also a shared quota (share point, Ms group storage, powershell online environment, dataverse, etc... ) of 1 to 25tb + (x size per user) the size per user depends on a multitude of factors. I did not mean to imply that users limits are connected to the shared pool, it is in addition to the user quotas.