I hope @helpix.world is still around, because I would like this list to be regularly updated. Anyway I'm planning an own incentive, with different "decentralization tiers". Basically until now my idea is the following:
Tier 3: All cryptocurrencies without premine, ICO and/or developer bonus. This already narrows down the current list a LOT. (This would include coins like Dash and BCash).
Tier 2: Additionally, no instamine (criteria for that have to be defined), stealth mining, and no centralized development. (In this list, for example Dash would not be included anymore, but LTC would, but only since Charlie Lee's departure as "benevolent dictator". An inclusion of forkcoins like BCash here would have to be discussed.)
Tier 1: Strict additional criteria like those helpix.world mentioned in the OP, like availability on exchanges, volume and DEX.
One of the MOST decentralized projects I know off is: Blocknet.
Unfortunately Blocknet is not suited for helpix.world's criteria because it was launched with an ICO, which implies a premine did happen.
Karbo should be on the list too.
Launched in 2016, no special treatment for the devs (not by random chance, but because this is devs philosophy). Actively developed (has ~10 wallet updates in 2020, and already 2 updates in 2021).
This could be a candidate. It would have to be proven that there was no premine, today unfortunately I can't inspect the source code but I may do in some days.