@BeAware I would maybe nuance your first phrase like this: "so basically, it's not decentralized, but the technology is there if some people with a medium amount of resources want it to be decentralized."
It's currently not entirely up to bluesky to decide how decentralized the network is. They have in their roadmap things planned that with help with decentralization, but everything is currently there for people to make it more decentralized.
However, the BlueSky company COULD make it harder to decentralize, for example by only allowing THEIR AppView to consume from their Relays (firehose). This is why having more independant relays will be key to ensure that ATProto becomes more decentralized. If you know about TOR nodes, it's kind of the same things. If one entity controls most TOR nodes, this entity owns the TOR network, which is not supposed to happen.
TOR as a protocol and network kind of has a similar problem, as running a TOR node can be expensive.