What functionality would you choose for the first smoke suite of a streaming service (Netflix, Amazon, etc.)?

For the first smoke suite of the streaming service, I would choose a minimal set of critically important features to test the core business processes and the stability of the service:

• User authentication (registration, login)
• Viewing the list of available movies/series
• Video playback (testing the player launch)
• Catalog search
• Subscription/content access check

Smoke tests should quickly identify critical errors, so focus on testing main user scenarios without deep functional testing. For example, verify that after login, the user sees the catalog, can start a video, and receives a correct response from the server.