Maybe someone's mining farm got hit with an outage or other electrical failure.
[...]
Anyways, transactions are taking days to confirm, I see. Bad news for folks who tried to pay for something to payment gateways with an expiration date.
If one sets a high enough fee, it still takes 10-20 minutes to get mined.
But I think that you've visited mempool.space in one of the (rather often lately) moments its data is off and it shows like there was nothing mined for a day. In such cases it's healthy to double check with another explorer...