Sym-whatshisname said "sponsor". That's very different from "donor". Sponsorship is very likely to be a contract because it implies that the sponsor is receiving something in return. Words matter. No one forced him to call it that, his choice, his contract, his failure to execute.
He basically bought some temporary reputation without paying for it when he decided his reputation isn't worth the money anymore."Trick".
This new nickname fits nicely 
How did Ratimov manage to pull off a username change?
In the past week, at least 4 users got a name change.