As far as I can tell Microsoft do an excellent job at managing data centre capacity so I completely understand the reason for having limitations on resources in place. There is no such thing as a limitless cloud platform.
Note; in a lot of cases (as you’ll see in the below table for Data Factory) the MAX limitations are only soft restrictions that can easily be lifted via a support ticket. Please check before raising alerts and project risks.
Click through for the limits, and “contact support” definitely is good advice if you’re expecting to push past those limits.