That is a complete nonsensical claim & willful attempt at spreading misinformation:
Permissive licenses doesn't grants you less freedom than GPL, infact it grants you more because the user also has the freedom to modify source code without being enforced to make it public.
Companies copying the codebase to their propietary ones won't automatically strip right of users, licenses don't work like that, the original codebase will still be fine. Whether said companies will contribute back is irrelevant.
Permissive licenses doesn't grants you less freedom than GPL, infact it grants you more because the user also has the freedom to modify source code without being enforced to make it public.
Companies copying the codebase to their propietary ones won't automatically strip right of users, licenses don't work like that, the original codebase will still be fine. Whether said companies will contribute back is irrelevant.