Twitter is unique in that it was acquired for US$ 44B when it was a business that lost huge amounts of money consistently for years, and the owner intended it to have it run old school style, as in making a profit, but also doing so in such short notice that he dismantled entire branches of the company wholesale.
Obviously for people relying on pre-existing services and rates from Twitter, it sucks.
But the root problem is that Twitter had not been a sustainable business for a long, long time. One has to wonder how did they even subsist for so long and how much institutional money, not just VC/investor money, and who knows what sort of government/agencies pay-to-play deals made it even possible because the sort of money they cashed in during the only few years they've even been profitable seems absurdly high and they have never replicated that under normal circumstances.
With the ad model struggling and institutional ads sort of in retreat, the entire sector is struggling.