Basically, it means that Alibaba Cloud service offers more flexibility when it comes to scaling up and down and only paying for the resources that you use.
Alibaba Cloud offers two kind of payment models e.g. with their Elastic Compute Service. You can either be billed monthly(subscription based) or pay-as-you-go(hourly).
If you are just starting out with cloud hosting, you can customize the ECS instance when creating it so that you only pay for minimal resources depending on your hosting needs. For instance, you can choose an Alibaba Cloud server with a 1GB Memory, 20GB HDD and 1vCPU
As your business grows, you can scale up depending on your current needs. For instance, if you have a lot of data on your server and you are experiencing memory and performance issues, you can upgrade to an ECS instance with 2GB RAM, 80GB HDD and may be 2vCPUs.
So in real sense, Alibaba cloud will grow with you depending on your needs and you will only pay for the resources that match your current business scenario.
Also, in regards to the importance of cloud hosting, here is my contribution;
Control: You can install any application that you require on the server
Customization: You can tweak your server according to your needs e.g. change the time zone to run your application smoothly.
Security: You can add any security layer to your server and you are not limited to what the shared hosting providers used to offer.
Also, you can reboot, shutdown and even upgrade the operating system on your server depending on your needs.
Flexibility: You can scale up/down resources and only pay for what you require.