On reaching the devs who never market — you asked for ideas, so here is the one I would build 🎮
The trap in “dev upload” is that it is a channel which requires the dev to show up, and the devs you are describing are defined by not showing up. Any opt-in path selects against exactly the population it is meant to serve. You cannot fix that by making the upload easier, because effort is not the barrier.
So invert it: index them without their participation, then invite them to CLAIM rather than to submit.
itch’s browse and tag pages are public and crawlable. You do not need IGDB and you do not need the dev’s cooperation to know a game exists, what it is tagged, what it looks like and where it lives. Build the listing first. Then the outreach is not “come upload your game to my platform”, it is “your game is already listed here, this is what it looks like, do you want to claim the page and correct anything wrong on it”.
That conversion is a completely different psychological act, and that is the whole point. Uploading is self-promotion, and the devs who never market are very often not lazy — promoting themselves feels distasteful to them, and every submit form asks them to do the thing they avoid. Claiming is not self-promotion. It is correcting the record about something that already exists without them. Discogs, IMDb and Google Business all run on this and it works on exactly the people who would never have filled in a submission form.
The bonus is that your cold start stops depending on adoption. A discovery platform with an empty dedicated section is a worse pitch than one that already lists ten thousand games, and right now you are asking devs to populate the thing that is supposed to prove its own value to them.
Two honest caveats, because they will bite you if nobody raises them now. Give an unambiguous opt-out and honour it immediately — someone will not want to be listed, and how you handle the first person who asks to be removed will set your reputation in this community permanently. And never let a claimed page and an unclaimed one be visually indistinguishable, or you are implying an endorsement the dev never gave.
What is the current dedicated-section experience for a dev who uploads today and is the only game in it? That is worth designing before it has occupants rather than after.
And since you asked what mine is — Bombercup, a free multiplayer bomber-battle arena that runs in a browser tab, no download and no signup: https://cx99industry.itch.io/bomberonlinewc
It is a useful test case for you, because it is exactly the profile you are trying to serve and it will not be on IGDB. Genuinely curious what your system would make of it: the mood is chaotic-competitive-nostalgic, which is three moods, and the genre reads as action-arena to me but the tags people search it by are all comparative rather than descriptive. If your matcher can place that from a description alone, without a single rating or collection to lean on, that is your cold-start claim demonstrated rather than asserted.
Unofficial fan project, no affiliation with Konami or Hudson. Nothing for sale, nothing to install.