The only thing that made twitter useable. No ads. You put your lists of people into columns, so you only saw exactly what you wanted to see. No algos trying to shove “you may like” stuff down your throat.
I use it for work reasons but I’m not paying for it, I’ll deal without and start digging into what needs can be fulfilled with mastodon. I stopped using it the first time it broke for a week due to elon and I thought it was over then.