Java was free, too; and at the time, djgpp was effectively the only free c++ toolchain on DOS and Windows.

Common Lisp wasn't even available to DOS and Windows users, let alone free or corporately backed. Even now every single free common lisp has substandard or outright broken Windows support.

Common Lisp didn't bother to show up to the party. That's the first problem; it was priced terribly, when it did become usefully available.