Mastodon isn't a single web platform like Reddit. The phrase "among the top-ranking posts on Mastodon" is meaningless. There is no "the top" of Mastodon.
I’m obviously talking about the main Mastodon instance and its Trending view [0]. The main instance has cultural prestige for the other instances that form the fediverse as people here normally define it and is regarded as exemplifying its values. But we’ve seen you disingenuously try to downplay issues here with the fediverse before.
It's a federated communication protocol, like email and SMS. There's very much a culture for each, regardless of whether or not it's hosted on a single server. Most users don't even know whether or not a communication system is federated, they just know they can use it to send messages and that there are social protocols around using it.