The #ActivityPub spec only describes how servers and clients should communicate, it doesn't cover how that data should be presented to people.

I think it's only a matter of time before someone builds a timeline algorithm for #fediverse content that might even show #ads.

I'm not sure how I feel about that yet, but if it allows people that run servers to cover their expenses, it could help ensure that they (and by extension, your content) stick around a lot longer.