SECaaS
DRaaS
UCaaS
IaaS
Microsoft Azure
Google Cloud
SaaS
Most services can be subscribed per month or per year.
This is espacially valuable for seasonal operations. You pay only for the months you use the service while during the dormant season you pay nothing, not even a "activation fee" of any kind.
With almost all plans there is a 5% - 20% savings compared to the equivalent monthly plan. This allows you to pay upfront instead of 'remembering' the payment each month.