Are there really that many blind (or perhaps low-sighted?) people surfing specifically memes communities though?
Accessibility is definitely difficult, e.g. it is really hard for someone without specialized tools to even so much as see that accessibility text in the first place (even in Firefox, though I mean on mobile Android).
And looking at several previous post to this community (moving to my desktop where I can actually see it, even though I've been sitting at work all day now and would rather look at little screen to relax than continue with big screen for longer...:-P), it looks like most people are simply putting the titles into the Accessibility text.
So what is your argument for any added value that offers, for someone to see simply the single word "Austria!" or the phrase "I will miss him dearly", but cannot see the rest of the post? Like the latter was a cat being exchanged for RAM, poking fun at the high prices that computer memory has risen to lately... absolutely none of which is conveyed by that short snippet of alternative text - how is that "right" to have that, while what I did was therefore by implication "wrong"?