Zend certified PHP/Magento developer

Is it possible for a Magento 1.x Enterprise website to still run?

While trying to get some Magento (Adobe Commerce) insights I come to this webpage:

https://sansec.io/magento-usage-data

And, to my surprise, it says there are around 25% of licensed Magento instances running version 1.x.

Is that possible at all? I thought once the licence expires these merchants were forced to upgrade to 2.x. Is it possible to renew those M1 licences?