If you compare threads within a year you can notice lot of developers re-posting their offers from month to month, some of them have pretty strong profiles and still it happens. I don't believe that all of them are that much picky, and especially incapable for work or to pass a reasonable interview.
Similar for companies, some of them have pretty small teams and very common tech stack but still can't fill position for months or even a year, makes me want to ask myself "How is their project even progressing in meantime... do they even have a real project and urge for developer or its completely optional".
I know it's market crisis atm but still it doesn't explain it completely, do you have a proper explanation?