I'm not convinced that the right people to help the "global poor" are Silicon Valley technologists. Scientifically-minded entrepreneurs focused on profit but with idealistic rhetoric attempting to "help" cultures they know nothing about has, historically, not worked out great.
In spite of the radically different culture, Uber has improved transportation. It turns out putting Indians into a car and charging them money works a lot like doing the same for Americans.
Facebook and Whatsapp have improved communication.
At work, Slack, Salesforce and Jira work the same as any western office.
Why, exactly, do you think other cultures and the global poor can't use SV technologies?
The parent comment, however, seemed to imply that technologists should focus on "solving global poverty" instead of solving local problems. This represents a fundamental shift, because at that point SV technologists are attempting to solve problems they personally do not have experience with.
All the examples you provide solved problems that SV itself had- transportation, communication, etc.
But I don't think concentrating on local problems is the right solution given that there are much more important non-local problems to solve. Perhaps entrepreneurs should concentrate on profit and then donate what they earn. Alternatively, they could learn about important problems and partner with experts in those problems to avoid naively doing more harm than good.