Underdstanding this is just content, I get that, but I dont think this will happen. If you look at the services offered on Fiverr versus what you see on LinkedIn its completely different.

You can hire a psychic on Fiverr.

You can buy backlink SEO spam on Fiverr.

You can even hire people to clap for your Medium articles...

You can't do that on LinkedIn.

There are also people who use both LinkedIn and Fiverr but wouldn't want to mix the two.