EA began in 1982, not 1987. If I google 'c64 electronic arts', the entire first page of results is about games. Same with 'atari 800 electronic arts'; 'apple ii electronic arts' brings up mention of a few of their various 'something construction kit' titles, about half of which were really just games with level editors.

From the wikipedia page on DPaint: DPaint began as an in-house art development tool called Prism. As author Dan Silva added features to Prism, it was developed as a showcase product to coincide with the Amiga's debut in 1985. [...] Deluxe Paint was first in a series of products from the Electronic Arts Tools group, which included such Amiga programs as Deluxe Music, Deluxe Video, and the Studio series of paint programs for the Macintosh.