You have this fear because it is under a permisse license that everyone is
going to take it and make it proprietary.
Not "everyone" but you are included among the bad guys who want to subjugate
their users at a lower cost (please, spare us the hypocritical "real freedom"
talk this time). I never ever want to see my work helping proprietary
software developer subjugating their users. Not even once. The copyleft does
that.
What is the great advantage of non-copylefted licenses? I mean: besides
helping proprietary software developers (which is only good when pushing a
standard)? As a developer you cannot even take advantage of the huge amount
of GPL code that is available (because, like it or not, but the GNU GPL
remains, by far, the most popular software license). In what way is it "less
restrictive" (as you write)? Again I only see proprietary derivatives as an
answer. That does not make me "feel more comfortable".