However which way you want. From a big publisher like EA to a small indie developer it's whatever best fits your product.
An example
Played Fifa 20. You buy a player pack. In it is a rare ICON card like Pele 1958 World Cup winner. Currently, the Entire economy is centralised. Now the entire economy is able to transition to the ION block-chain which if your EA means the cost of maintaining the economy is significantly reduced and if your the gamer that bought the pack they now own an asset on-chain which gives the dev a lot more flexibility in its consumer offering.
Now if you're a small Indie developer...

For an Indie developer, it's not just about plugging into an economic infrastructure.

The limiting factor is your imagination

I appreciate that this was just an example, but the fact that the game economies across the titles a company like EA offers are centralised is beneficial to EA because it affords them ultimate control over in game assets. Theres no compelling commercial reason why theyd be motivated to move to a decentralised model, and certainly no reason why, if they were interested in implementing blockchain, theyd use something like GameGrid to do that rather than develop a solution in house.
In addition, most consumers do not care about decentralisation or being able to prove ownership of in game assets. They simply consume them to play the games and dont think any deeper, and thats not going to change any time soon. This is a very niche idea that currently holds little sway outside of crypto circles.
For indie devs - again, I cant see why youd try and work with Ionomy when the proven audience isnt very big. If Ionomy had already proven its viability and gotten perhaps tens of thousands of gamers engaged, then there might be some motivation there, but right now joining this eco system would only likely net you 10-15 engaged users from a niche discord channel. Theres no attraction there if Im an indie dev looking for quick monetisation.