Because Nostr is messed up. Anyone (Nostr maxi's) who think Nostr is going to replace Twitter are in fairyland. As long as users have to deal with relays it won't get any more than a tiny fraction of the number of Twitter users ever. Currently a debate on here is whether small relays are better than large relays. It's ridiculous. 

 I remember the same discussions in the early days of the internet. Time will tell, in the meanwhile I will rather spend my time with likeminded people on NOSTR. 

X will start shitcoining again, I than I rather build up my network here. 

Human ingenuity will figure it out. 

 I deleted my Twitter account before Elon bought it but the simplicity of Twitter is what most people want, there's no way they are going to replace something they use with something more complicated if the end result is just the same i.e. shit posting on social media.