The way I would like to see tag spam addressed is for every community to have a strictly enforced list of allowed tags.
Since every post would be limited to the tags allowed by the community it is posted in: they wouldn’t be able to spam more than a handful of tags.
*Kif, old man, I’ll be in the escape pod.
If that wicker chair I like survives the slaughter,
have it sent to my P.O. box.*
Some googling shows it’s from X-Men: God loves, man kills