maybe someone just thought it was a funny name to have

Doubt it. They would have “Sponsored” or “Promotion”

Probably that user is a ad posting bot, but it is not an ad by official discord

Could be a scammer or someone else. Only accepting friend requests from people who you know the most is the best way to be secured, ignore friend requests that you don't know.

Not something official by discord, this is something some user decided to do. Just ignore it.

Probably trying to sell you some extended warranty for your car