Because larger companies have a stable enough need for space, even in the remote realm, to make it worthwhile to have long-term leases. Even if offices become group-meetup spaces rather than more traditional desk space, it still makes sense to run your own if your scale justifies it. A company like Microsoft for example has enough persistent need that they should just reformat their existing holdings to be group-meetup-y. They have no need for an intermediary like WeWork.
Which leaves the market only to companies too small to justify running their own offices - which coincidentally is the same market WeWork targeted pre-pandemic, so remote hasn't actually changed much, much less significantly expanded their TAM.
Also worth a heavy and hearty thumbs-up on the other reply: be aware if the service you love is because the company is very well-run or has some technological advantage... or if it's because you're being sold $100 worth of goods/services for $50.
Free shit is always a good product.