At the moment, I don't see any major danger here, since the coin is not traded on any large exchanges. Nevertheless, you can exert an economic influence if you run your own mining pool, for instance, by offering zero-fee mining or providing other types of bonuses to miners.
Agreed, without big exchanges there's not much to gain from an attack right now, but we'd rather fix it before it matters.
On our side, the official pool already runs at 0%.
It's a service we provide to support the network, we don't take anything from mining.
The 90% isn't permanent either, Mining Dutch is clearly the biggest active miner, but when zpool comes in their share drops right away.
The good thing is we know exactly where that hashrate comes from, Mining Dutch is a serious, established operator with nothing to gain from harming a network it earns from.
Still, it's not a healthy situation and it needs to improve.
What the network really needs is one or two more big pools, and we've already reached out to one, we're waiting to hear back, and if it doesn't work out we'll go around the larger pools again.
About bonuses, we'd like to, but it doesn't fit our status today...
As a European project we stay within MiCA as developers (Article 4), not market makers, so anything that could look like a market incentive stays out.
Nothing is set in stone though, we move with the project and how people receive it, and if things grow, our options may change too.
No promises on that, it all depends on how the project does.
