Spam
by clay groves
cost
You will get spam that wants you to join something and if you join them they will tell you that you started receiving charges. You can choose to stop or receive the charges and most likely they will keep bugging you about it.
time
Spam takes a lot of time to go through because you get so much of it. It takes longer to delete the spam and you will keep receiving it.
content
The content they use is often turned into malware. The content they use is used for fraud.
how to avoid
Spam filters, Do not reply.