我瞎猜的，CBP发起流程剥夺LPR要么是离境太久/过去几年在美国天数很少（“跑卡”，即使每次离开不超过六个月）要么是有犯罪记录（哪怕是重名）。请 @bossdao 补充更多信息吧。
https://www.cliniclegal.org/resources/absences-are-too-long-and-how-cure-them
Abandonment of LPR status is determined by a number of factors, however, and the length of the absence is only one of them. The factors that the agency will consider include the following: the LPR’s intent when leaving the country; any employment abroad; U.S. business affiliations; ownership of residence or property holdings in the United States; payment of U.S. taxes; length of time in the United States; community ties developed before the departure; maintenance of a bank account, club memberships, or other social ties within this country; and U.S. residence of other immediate family members during this period.
工作、报税、住房之类的其他因素法理上也要考虑，但入境时又看不到，还不是靠出入境记录和犯罪记录为主。