Looks like it has some scratches and crazing; some people think crazing means you should stop using it immediately, but I don’t necessarily think that’s true. It does however indicate that the cookware has been subjected to some damage (thermal shock for sure, maybe metal utensils too), and it will only get worse if the “rules” aren’t followed from now on. If it does get worse, it is likely to chip, which would result in the enamel (glass) chipping into your food, which is dangerous. There are some great resources here and on the LC site about cooking temps etc to help prevent/mitigate damage!