You've raised important issues. I always advise new cryptoartist to go for superrare before any other. They have built a prestige that helps artists because it attracts collectors giving them the idea that they'll only find the best of the best(even when it's not always so). The point is that that's a market strategy and it works.
As also with Makersplace, they present their best in the best way possible. Makersplace accepts almost every creator but the site is heavily curated on the frontpage.
I know these may have some negative aspects but Nftshowroom needs to attach little responses like 'likes' 'comments' 'views'. May not benefit artist with little following but it inspires growth.
Thank you,for those actions points. Certain standards need to be maintained. I am guilty of breaching some when I'm bored. I hope to be better at self curation.
The most important thing is that Nftshowroom is developing and there are people to point out what's on the right track and what's not.
RE: I tried to Onboard an artist I respect to Cryptoart, and found NFTShowroom was lacking.