There's the Tipjar right here on this website

"he normally says that he doesnt accept donations"

Where have you heard that?

The donation link on youtube refers back to the tipjar page here on this website, where it says "The subscription revenue, while helpful, only partially defrays the cost of operating Day[9]TV. If you have the means to offer additional support so that Day[9] can continue his efforts to grow eSports, we invite you to make a one time personal donation to his tip jar"

You are right however, that he prefers the term "tip" over "donation", since tipping implies recognition for a job well done and donation doesn't have that positive ring to it. See this tweet for reference.