Why don't big companies store passwords in md5 format?

Question

Passwords

Why don't big companies store passwords in md5 format?
After all, in the event of a hack, hackers will not be able to understand user passwords.

Answer 1

Because md5 is easy to brute force.
There are many databases online with md5 already decrypted.
When I needed to raise a password of 8 characters from md5, I don’t remember which one to enumerate on i5 + geforce, it took about 8 hours.

Answer 2

Because there are so-called "rainbow tables".