1500 tweets per month
Did you guys expect a free lunch to last forever?

Why should someone provide a free service to hundreds of millions of people who spam it 24/7/365 with self promoting BS, scams and every form of degeneracy known to man?
Why should someone provide a free API access for someone who makes money off that very same API access?
Unless you are running a business that depends on Twitter API (then pay up like you pay for utilities etc.) nothing changes for you.
Good news is, millions of bot farms crash and burn. Maybe one day, Twitter noise to useful info ratio becomes acceptable and I actually bother to sign up. Probably not. I cant care any less if Twitter, Reddit, Facebook, Insta-blah and the rest go out of business tomorrow. Good riddance.