If you only use your own feed of followed users and hashtags, you won't likely see any of it. But it can still be a problem for new users, and it's antithetical to the idea of the fediverse being run by people for people. There's a certain degree of leeway in what can be considered a person for this idea, but once a company that's publicly traded dives into things, it starts fraying at the edges.

Basically, those companies start treating their ability to "toot" as free ad space. That isn't cool. We should all be able to use an "all" feed without the bullshit.

And that's ignoring the possibility of a company making accounts on instances to artificially "retweet" their bullshit, which just isn't cool. It's bad manners.