There's nothing preventing Bluesky, or someone else, from building an "algorithmic" feed on top of the AT protocol. That's what the Discover feed is, for all intents and purposes.
What is harder is Bluesky forcing users into their flavour of an algorithmic feed, the same way e.g. X doesn't let you remove the Trending section, or how Reddit always shows you comments ordered by "Best". Bluesky users currently can choose the feed they want to use.
You have a point, but custom Feeds are one the main features of BlueSky. I have several Feeds for different interests, Twitter doesn't let you have these types of custom Feeds. I think it's unlikely they'll ever remove it. I can always ignore the Discover feed.
What is harder is Bluesky forcing users into their flavour of an algorithmic feed, the same way e.g. X doesn't let you remove the Trending section, or how Reddit always shows you comments ordered by "Best". Bluesky users currently can choose the feed they want to use.