Looking at the fortunes of the Casper place in the time since, Wikipedia has it:

https://en.wikipedia.org/wiki/Casper_Sleep

    On February 6, 2020, it went public at $12 per share, translating to a market value
    of $476 million ...

    On March 31, 2020, its stock dropped to $4.12 per share, translating to a market
    value of $163 million ...

    In April 2020, Casper announced the winding down of its European operations and laid
    off 21% of its staff ...

    In November 2021, Casper announced that it had entered into a definitive agreement
    to be acquired ...

    The transaction completed in January 2022 and Casper's stock was delisted from the
    New York Stock Exchange.

Disappeared with barely a whimper it seems like.

Love it. And now that I think about it, I have stopped noticing the incessant Casper ads scattered around SF

That's a great article, thanks for the link