Why does Binance deposit $10 of Tether into my account every 6 hours ?

I have noticed that I get roughly $10 of Tether plus a bunch of other random coins deposited to my Binance Wallet every day ...

I only Hodl BTC, BNB and a little Cake there ....

Does anyone know why Binance makes these other deposits ?

I’m able to convert these “dust” amounts to BNB every 6 hours but I can’t find out why Binance gives me these extra coins and Tether every few hours ....

I’m not complaining, I would just like to understand why this is done so I could maybe add more of something.

Update: I did some digging, I think these are referral rewards ? I have 3 Referrals ... ... https://www.binance.com/en/register?ref=QB3O53XC

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