You are right, I don't know.
Just checked and my posts were also removed by reddit spam filter without giving me any notification.
No wonder I got nothing out of reddit.
I can suggest DISCORD servers then, those work best.
On reddit, I would guess not using links, just account name maybe.
Or none, just wait for a DM on reddit and then give them fiverr link.
You can talk about the job before you give them any link.
Fiverr is a way for them to pay you after all.