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I think it just means they had been partnering in the past and now they're expanding it with more investment.

I think they were complaining about grammar. Shouldn't it have been 'spending' rather than 'spend'?

Using the infinitive rather than gerund form of a verb to reference a an instance is a common pattern. "I went for a walk," instead of "I was walking."

I think it is interesting to attempt understanding people's choices to shorten "spend" rather than "spending," or to use something longer like "methodology" rather than "method" when they describe the method not a study of methods.

yes, I was complaining about grammar

Spend used as a noun is a common finance term. I also hear “spend rate” used similarly.

It would be weird (but not necessarily wrong) to use that word as a noun outside of a business finance context.

"increase investment with" maybe?

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