Instances have downtime from time to time, some moreso than others. Per fediverse.observer, feddit.online seems to have a lower uptime rate than other Piefed instances.
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To be fair, if anything on the internet has too much traffic, it becomes unavailable. That strategy is at the heart of (D)DOS attacks.
I think this can only happen on larger instances that don't have the infrastructure to scale for spikes of high demand. This isn't a flaw of the protocol; you'd have to speak to the people who host your instance about the issues it has.