That's not how science works. During my scientific career I gave code and data away to any and all who wanted them. That includes critics, competitors, and anyone else who was curious.

I felt my results were solid enough (and that my skill at producing more results was good enough) that this wouldn't hurt me. This was just how things worked in my field (physics).

Interestingly, my experimental colleagues rarely felt that they couldn't reproduce results they saw in a paper.