Well, Sun own MySQL. But the drop-in replacement MySQL engine makers (infobright, percona, etc) might be a little worried.
But my point still stands: makers of replacement engines for MySQL could be in violation of MySQL-related patents, which Oracle could then sue over.
Other database vendors (Percona et al., not IBM) don't have assets for Oracle to take, don't directly threaten their core business, and going after them would get Oracle in trouble with regulators.
Better to land a tuna than chase sardines around.