Why Snapshots of the model, master, and tempdb databases are prohibited
taking snapshot on hourly manner is very useful for active databases and based on RTO (Recovery Time Objective) and RPO (Recovery Point Objective) which is less than 1 hour.

Model, master, and tempdb is passive default MSSQL databases.These database doesn't required to snapshot hourly as there wont be much changes occur every hour.One time daily backup is sufficient enough to rescue the database in the event of disaster.

Moreover, snapshopt will use up spaces and available resource (RAM and CPU).