You will see the posts of the people you follow: so even if their is spammers/scammer, you won't see what they post if you don't follow theim Regarding the fee

You will see the posts of the people you follow: so even if their is spammers/scammer, you won't see what they post if you don't follow theim Regarding the fees, it would be the chain fees, for example on polygon it's like 0.00001$