AWS does this too, also to the tune of 100k iirc. You just need to show that you are funded by a known VC, and then each subsequent funding round gets you additional credits.
* Free support and consulting (probably useful for some less technical companies)
* Free or discounted resources for POCs (ie: "This customer wants to do a 3 month POC, we're going to spend literally 0 dollars on that infrastructure")
* Other misc stuff depending on the org