nitter.net is currently replaced with a message about the C&D until zedeus (lead dev) gets legal advice on how to proceed. Other instances are probably ok for now (or at least until an API break). Not a great sign for anyone else who hosts it, but hopefully it gets resolved without development permanently stopping.
Some alternatives (for now): https://github.com/zedeus/nitter/wiki/Instances, https://status.d420.de/
Is there an alternative you can selfhost?
No need for an alternative, it can be self hosted and (for now) the original repo is still up: https://github.com/zedeus/nitter
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