These are all low-traffic projects so it's more cost effective to just throw on the smallest LB than spend the time setting it up myself.
Did your high availability system survive this outage?
They wouldn't survive DO losing a DC, they're not so mission critical that it's worth the extra complexity to do that, and I don't recall DO losing a DC in the past 10 years or so.
They did stay up during this outage, which was apparently mostly concentrated on a different product called the 'global load balancer', which ironically is exactly the extra complexity I mentioned to in theory survive a DC outage.
Keep in mind these are "important" in the sense that they justify $100/mo on infra and monitoring, but not "life critical" in that an outage is gonna kill somebody or cost millions of bucks an hour. Once your traffic gets past a certain threshold, DO's costs don't scale that well and you're better off on a large distributed self-managed setup on Hetzner or buying into a stack like AWS.
To me their LB and DB products hit a real sweet spot -- better reliability than one box, and meaningfully less work than setting up a cluster with floating IP and heartbeats and all that for a very minimal price difference.