Nobody gets paid less than minimum wage. The employer needs to make up that difference if tips don’t cover it.
Personally, I don't believe that at all. I do conceed that, if this were the case, things would be fine.
At the same time, employees know that tips are incredibly lucrative for them, and would rather have a sub minimum wage day every once in a while for the on average above minimum wage pay. There’s a reason servers don’t want to get rid of tips.
That being said, none of this is my problem as a customer. If you choose not to pursue your rights that’s on you at the end of the day. I’m not going to feel bad that your scheme to have me subsidize your wages failed.