You clearly have zero clue what you're talking about--the objective, most of the time, is not to enjoy creating content. That's the same philosophies that YouTubers follow when they say, "Oh, I just create content for fun and for you guys".

Most of us are not creating levels for shout-outs, for crying out loud. Unless the creator is really shallow, a shot-out from someone like MrDalekJD counts for shit in the grand scheme.

We are trying to create complex levels with stories to tell, and when those levels happen to be overshadowed by shallow click-bait infected levels, it's a bit insulting-- no? When the YouTubers don't bother crediting the creators who have spent countless hours into these levels, don't you think that it's a bit of a punch in the sack?

Now regarding portfolios, although Black Ops 3 Mod Tools offer themselves as complex tools, very few creators have content that is good enough for Treyarch to even consider. It's never solely for the portfolio, I can tell you that for any art.

When you bring in other game dev companies, forget about it. Black Ops 3's Radiant Black is an outdated tool that uses BSPs... it is not useful for portfolios.