Yes, you can use stop$.complete() to unsubscribe from a takeUntil operator, but it is not the recommended approach.

The takeUntil operator is designed to unsubscribe from a source observable when a second observable emits a value or completes. It is often used to manage the lifetime of a subscription and to prevent memory leaks.

When using takeUntil, you should use an observable that emits a value to trigger the unsubscription, and completing the stop$ observable will emit a completion signal, but it may not immediately unsubscribe the subscription.