My main question is : If I only respond to bounty posts online, Will I have any issue with my account?
This should be enough for your peace of mind;
a statement regarding bounty post from mprep (
Global Moderator).
I Highlighted it for you, you can also click the quote for the full post:
Accepting signups or requiring proof of participation for tasks requiring substantial effort (e.g. signature campaign signups, weekly social media campaign reports, media (videos, images, articles, etc.) bounty signups, etc.) via a thread posted in Bounties (Altcoins) is allowed though.
...
Just make sure to check the bounty's OP if the author is kind of paying the participants to bump the ANN or bounty thread.