centralized and decentralized would include almost any service. your comment is so vague and ambiguous as to be meaningless. (that's a hallmark of LLM output. are you a bot?)
it was easier to find authoritative answers 20-30 years ago. google and, before that, altavista and yahoo, were quite good at directing queries to things like university-run information sites or legitimate, curated commercial sites. for the last decade the first google page has been crammed with useless SEO optimized fluff.
as for shopping, that was the first dotcom boom. what really took it mainstream was covid. not centralized or decentralized collaborative nonsense.
