That should be legal you just have to make sure you can handle 20+ posts a day. If you participate on yobit like me, responding to threads can drain your brain out with just 10 posts.
it is ok IMHO as long as you can maintain good/high quality of your posts otherwise all your account might get permanent ban depends on how bad your posts are
What do you mean with IMHO? Of course all of posting are constructive if are not, they are immposible accepted by signature campaign.
IMHO = In My Honest Opinion
well, some signature campaigns like yobit doesn't check their participants posting quality first before they get accepted
That is not true. they'd be banned on yobit if you don't make quality posts.