Do you need an ICP licence?
An ICP License is only required if your website is hosted or delivered via CDN from inside of Mainland China.
If you have a website hosted in China without a valid ICP License, after an initial grace period your hosting or CDN provider will shut down your website until you can prove you have a valid license.
If your target audience is inside China you have the option to deliver your content from outside China leveraging on your hosting or CDN provider peering and transit agreements or to apply for an ICP licence or to choose a CDN that offers a shared ICP licence that you can use.
Delivering content from inside China is faster and more reliable but might not be applicable to every business depending on budget and type of content you want to deliver from inside China.