Non-root install, both customer and I was test on Amazon AMI installs which are non-root.
Error msg of "we_splitterapp: setuid failed" is issued, even on the help

$ cpimport -h
we_splitterapp: setuid failed

$ cpimport test tmp1 tmp1.tbl
we_splitterapp: setuid failed
2019-08-14 19:50:22 (6160) INFO : Running distributed import (mode 1) on all PMs...
2019-08-14 19:50:22 (6160) INFO : Row numbers with error reasons are listed in file : tmp1.tbl.Job_3000_1568.err_2
2019-08-14 19:50:22 (6160) INFO : Exact error rows are listed in file : tmp1.tbl.Job_3000_1568.bad_2
2019-08-14 19:50:22 (6160) INFO : For table test.tmp1: 1 rows processed and 0 rows inserted.
2019-08-14 19:50:22 (6160) INFO : Bulk load completed, total run time : 0.274584 seconds