Does anyone know why this is happening?
Promotion, advertisement and an attempt to scam those newbie investors who are here.
That's pretty much the entire reason, and OP is relatively new to the forum so he might not be aware that this crap happens all the time--and that Bitcoin Discussion is a haven for shitposters of all stripes. This is a bitcoin forum (and the biggest one by far), so you'd think that section would be of the highest quality, but it's the exact opposite.
And that's no dig on the moderators of Bitcoin Discussion, because trying to keep that section clean would be a full-time job for a team of people, which bitcointalk doesn't have.
So yeah, please just report threads like those. It helps the community when you do so, and it's an unacknowledged deed but a good thing for everyone.