Hello, I'm newbie here and notice that many bitcointalker's when posting, have a signature of some company, project, ISO, service, etc.
Example, a ChipMixer signature, in each message they advertise ChipMixer with the signature.
Question : Do they get money for signature advertisement, or they do it for free?
There are companies that pay users of this site to include their advertisement in a space under each post/comment. The users of this site have to request to be added to a “signature campaign” and if the company determines that the user has good post quality, then they may be accepted. You typically have to be at least a member or higher to be considered. We do get paid, but payment amounts can vary depending on the campaign.