The answer
Yes. A preview can use the provided address while the product is being evaluated. Introduce a custom domain when a stable public identity becomes useful.
Why should a production application use a custom domain?
Is a hosting provider's default domain enough for an early wedding-app preview?
More FAQs in Why should a production application use a custom domain?
No. Domain ownership concerns the address. Protecting guest information also requires sound authentication, authorization, data handling, and secure application behavior throughout the service.
Assign responsibility to the product owner or an accountable team member. Record renewal and recovery arrangements so the application does not depend on one developer's memory.
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