It’s pretty easy to build an emission or reward schedule into the rules of a decentralized network
when the software that nodes are running see another compliant node, they expect for it to be rewarded so they all conform to the additional issuance of tokens
you just need to make sure that sybil attack attempts improve the network, as the attacker adds more nodes to earn more
Why wouldn't it be possible? My friends know what when I show up to a party, I usually bring a drink or a dish or something. There's no centralized database for this, they know because they've eaten and drank those things. We don't use tokens to keep track of this, but we could. The situation seems similar with seeding.
It's just not commonly done because you have to build and maintain a web of trust for it to to work, and that's often a level of user responsibility that's hard to cultivate. But if you need that web of trust anyway (e.g. for filtering out ads ad other disinformation) then you might as well use it for consensus about who is a good citizen and who is not.
(I have no idea if this is Tribler's approach, it's just on my mind because I've been designing something quite like Tribler, and it's my approach.)
How can this be possible in a non-centralized manner?