When GitHub's financials got leaked in 2016, GitHub's personal accounts accounted for 12.5% of their revenue. GitHub Enterprise was 50%, their organization (= business) accounts were the remaining 37.5% [1]. It's fair to say that the personal accounts are irrelevant from a revenue perspective.
[1] https://medium.com/@moritzplassnig/github-is-doing-much-bett... (disclaimer: I wrote the article but the data is by Bloomberg)