That clearly wasn't even an issue in the past. It's only since Musk took over that theres been anything said on the possibility of Twitter closing up shop, which as we all know frm Musks' well know history of spewing nonsense, will not happen.
Twitter's 2021 wasn't really that bad. They increased revenue about 37% year-over-year to $5 billion, at a loss of $220M.
In the pumped-up investment environment of 2021, that kind of relatively small loss was an acceptable trade-off for such high growth.
The revenue collapse of 2022 is clearly almost entirely due to the new ownership who did their best to destroy advertiser trust, first by spending six months disparaging the company, then by indiscriminately firing moderation and ad sales teams.
Twitter has $13bn in debt on its balance sheet thanks to the ridiculous purchase price. Last week's bond payment of $300m is on its own, half of what their total net debt was pre-Musk ($600m)[0].
Twitter's revenue last year was $5bn. In a year's time it will probably be a fraction of even that; Twitter's user base isn't growing and isn't going to magically become more valuable in an economy where advertisers are cutting back on spending.