不是税，是ICANN薅的羊毛：Fee charged by ICANN
This mandatory fee is charged by ICANN (Internet Corporation For Assigned Names and Numbers:
www.icann.org). and becomes effective on November 1, 2004. It is 18 cents per domain name registration year. Thus, the fee on a one year .com registration would be 18 cents. The fee would be $0.36 for a two year registration (i.e. 18 cents times 2). Additional years would be at 18 cents per year.
ICANN fees apply to .com, .net, .org, .biz, .info, .name, .asia, .jobs, and .mobi.