Are you in USA? In UK (pubs/ restaurants that I've had an association with; some time ago) it was normal for tips to be shared with all staff. Maybe that was a UK/rural/independent establishment thing?
I'm old, so this was some time ago. The servers were supposed to share tips with the dishwashers etc. but in practice it was hit or miss since most of the tips were cash and could be easily under-reported. Not sure if it was a law to share tips or not