Yes they are free to vote or not but with you not being transparent about them being reposts, I bet 98% of those who voted aren't even aware they are reposts. It is also very insulting if you ask me, coming back here after being inactive cos you saw an opportunity to earn here on Hive but only repost and spam the chain with old content. I don't know for others though but that's just me.

You can always repost them, just be transparent that it is a repost (state at the title or in the description) AND don't do it frequently. Probably once a month will do.