You leak your IP address on every single service you use. This isn't Nostr specific.
Discussion
Just to twitter and your ISP tho on twitter right? Is this to anyone running a relay?
You could also use a service like nostrgram .co and only send your IP to them if it makes you feel better.. (like Twitter). Or nostr.wine, which provides caches of other relays for it's users.. big tech uses your IP address for questionable things like advertising that your fiance is going to divorce you cause it saw her search history from the same IP for example, and yet, you're still thinking it's 'better' to let Twitter know your IP?
Yes, this would be to the client and relays operators that you're connect to.