Adobe has a shit ton of product lines, people think of it as just the core Photoshop, Illustrator, etc., but just go look at how much random stuff there is: https://en.wikipedia.org/wiki/Adobe_Inc.#Products

That's in addition to running the big SaaS offering of the creative cloud and all of the other SaaS's (behance, adobe express, adobe stock, etc.).

All of those include software engineers, SRE, support staff, PMs, etc.. Then there's the massive amount of sales staff, go to market, etc.

There's also a lot of R&D and domain experts, stuff like Adobe Firefly? That was spun up in like a year apparently, probably continuing existing in-house research.