It is like a democratization of collecting art, instagram being the medium. The motivation for collecting digital art being the same as collecting physical artworks (paintings, sculptures, whatever).
On the other hand, it gives you an opportunity to support the artist you like and get something in return, in a similar fashion bandcamp does with music.
A marketplace like bandcamp would be more interesting IMHO, I regularly buy digital artworks from games or movies, that’s more analogous to buying an album on bandcamp.
The marketplace you propose could be interesting, but IG already existed with a huge number of artists who’ve already had a following/status/lore. Also there is the exposure to a tremendously broader&bigger audience than any other platform could possibly have. Not saying that migration would be unachievable, but so much would be lost for something that I don’t see come close to being a compensation
What you seem to want is a kind of tipping or patronage system integrated with Instagram if I understand correctly? Sounds like a cool way to support artists. NFTs are a very contrived way of achieving this.
https://about.instagram.com/blog/announcements/instagram-dig...