Not sure why people would like the Spurs are a good player in this. As others have pointed out, Hawks, Rockets and OKC all can put in way better deals than us, NYK, Raptors, and Cleveland are probably better fits than us.
The Spurs really good young assets now are Castle and Harper, even that Mavs unprotected pick is a maybe as the mavs are really a PG away from being a decent team (which they may have already found, and Kyrie is coming back next year). The Hawks and our own picks are meh, Fox is likely too old and not an enticing enough asset to be the main thing for a deal for Giannis (plus there is no way the Spurs will trade him due to optics).
I don't really see how Giannis will fit into our offence, but Mitch can make it work, I suppose.