I'm using this for about a month now and the only problem is the default instances that are used are getting rate-limited/blocked; so you will have to find or host your own fresh instance.
The name itself (twitter, youtube, etc) is meaningful to users. These "default instances" need ways to distribute the compute & network load while allowing users to only remember "nitter".
Are there any projects that address this? Would be curious to help.
It doesn't need to be "separate", but it does seem that many of these systems could use the same load balancer design.