If you register a domain with Cloudflare or Route 53, and that service goes down, do your records stay active in the DNS servers? What if the DNS servers go down, I know a lot of people use 8.8.8.8, so if Google’s server goes down, then DNS fails?
What are the potential point of failures for having your own domain?
The record will expire and, in this scenario, effectively become non-existent.
Once upon a time TTLs we’re rather long so temporary outages were less impactive. These days TTLs of less than a minute are common to accommodate redundancy. It doesn’t do want good to have redundant systems if DNS keep pointing at the downed system during an outage.