Good! Is there a security audit of this program? I personally can't read the code, and neither can 99 percent of users. And what if the developer of this program has implemented in the code that the basic keys are repeated. It may be a large range, so users will not notice. Then, at the appropriate time, all addresses created with this program will be emptied. So the base key is a security threat.
You must be crazy, man, to store your bitcoins on the vanity addresses generated by the tool the source code of which you are not able to read and understand.