Table 1 Influencing factors and data sources.

Target layer	First-level factor	Index	Unit	Data source
Politics	Government situation	Government effectiveness (GE)	/	https://data.worldbank.org /
Economic	Level of economic development	Per capita GDP	Current U.S. dollar	https://data.worldbank.org/
Economic	Openness to trade	Export value	Current U.S. dollar	https://www.cnki.net/
Social	Willingness to aid	Corruption perceptions index (CPI)	/	https://tikenya.org/
Cultural	Religion	Proportion of major religions	%	https://zh.wikipedia.org/
	Religion	Proportion of nonreligion	%	https://zh.wikipedia.org/
	Education	Enrollment rate in higher education	%	https://data.worldbank.org/
Natural	Natural disaster risk level	Mortality rate	Per 10⁴ people	https://www.emdat.be
		GDP loss rate	Per 10⁴ people	https://www.emdat.be
		Affected population rate	Per 10⁴ people	https://www.emdat.be
	Distance	Geographic distance	km	Calculation in ArcGIS
Demographic	Number of users	Population	People	https://data.worldbank.org/

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