Incidentally (or, crucially), this isn’t just a matter of opinion – it’s a clause in the forum Terms of Service:
By making Content available, you represent and warrant that: … the Content is not spam, is not machine- or randomly-generated…
Accordingly I’ll flag and remove a couple of posts in this thread.
Grammarly isn’t en-masse generation of large blocks of unreliable material – machine correction of human-written text is fine.
hjh