As to funding from big OSS players, the problem is that Ardour is niche software, far away from the interests of those big OSS players. Regarding your examples,
- Mozilla has interest and invests into web/infrastructure tech (see https://news.ycombinator.com/item?id=11956234 ), Ardour doesn't fit in here.
- GNOME... can you name these dubious programs you are referring to? To my eyes, GNOME just tries to survive with limited funding.