That's already 23% of their revenue, which is decently high for their size.
(Grabbing larger companies cause it's easy data)
Cloudflare: 18%
Google: 15%
Amazon: 11%
Microsoft: 13%
Apple: 7%
Meta: 21%
Sure they could definitely do better, but by no means are they spending "little".
High growth tech companies typically spend 26% of revenue on R&D, but these are primarily small-mid scale companies that are actively expanding.
The fact remains that RedHat is still one of the top linux kernel contributors in the past years.
Assuming RedHat is the same as my company, Sales and Marketing includes Sales Engineer and Client Implementation. And based on their Jobs page, that is the case. https://www.redhat.com/en/jobs/departments.
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