

Because it’s sometimes a ludicrous demand?
Common pattern I see in Mastodon’s … more strident, shall we call them? … advocates:
Poster: I just took a picture of a <insert bird>. Note the red and yellow flash of plumage, in contrast to the more usual green and red. I caught this little darling hopping along the charcoal grey slate walkway I’ve got running through my garden, right next to the <insert flower> you can see at the right side of the frame.
<put picture here>
Strident Twit: WHY YOU NO PUT ALT TEXT!?
Or, worse:
Strident Twit Bot: WHY YOU NO PUT ALT TEXT FOR OUR BLIND USERS!?
So what, precisely (providing details), would you put into alt text that’s not already in the post? Would you just copy and paste the alt text? When I ask the strident twits this, I generally get vague homilies and blocks.
No.
ActivityPub is a protocol. It has no agency.
People can save the Internet. Perhaps with ActivityPub, perhaps with something else.