A website communicates information. A digital product does a job. The distinction sounds simple, but it determines nearly every decision that follows.
Once a website ships, its work is largely done. It needs updates and content, but its behaviour does not change. The cost sits up front and maintenance is light.
A digital product starts working on launch day. People use it, their behaviour generates data, and that data has to change the product. The cost is spread over time and maintenance is permanent.
The common mistake is wanting a product but budgeting and contracting for a website. The project starts with a fixed price and delivery date, then no budget remains for change. Something that cannot change is not a product.
A quick test helps. If nobody touched the experience for six months after launch, would it still be valuable? If yes, you want a website. If no, you want a product and need to plan for it like one.