Apparently, Twitter instantly lost ~15% of their 2023 revenue because of their poor showing at NewFronts where a lot of upfront ad buying is done. And with Musk firing the very teams the advertisers care about e.g. ethics, brand safety, human rights the industry is turning against them. Decade of painstaking work by Twitter to attract these advertisers gone in a week. And even worse Musk fired many of the relationship managers and so the company can't smooth things over.
It really isn't inconceivable with this trajectory that Musk could bankrupt the company within a year.