Some web site providers will charge you extra if your web site is popular. GCP does not have any limits or extra charges for either the number of hits, or the amount of data transferred. While this small amount is sometimes enough, very often you need more. Especially if you have information in databases, or will be using on-line transaction entry. GCP web sites start with 10 MB of storage, which is enough for all but the most demanding sites.
Additional storage is available for a very reasonable fee.
GCP offers various discounts to make your web site even more affordable. You may think that's a good thing. In some cases, you could be right. Providing access to the Internet for their customers. That means, they have customers using their resources to access other sites on the Internet.