It is easy enough to badmouth something you don't know or understand.
Topping is whacking off the top of a tree, any species, in order to make it take up less room. We can all agree on that being a bad practise, I think.
Pollarding is another thing altogether.
As far as I know, it has the same origins as coppicing, namely the desire to be able to "harvest" branches or small (very small) logs with short intervals. With coppicing, the branches were used for firewood, fencing materials etc.
Pollarding was done for another reason.
It dates back to before the advent of iron cheap enough to make the scythe an affordable tool for farmers.
Back then the only way to winterfeed animals, since you can't make hay without a scythe, was to cut leafy branches and dry those to keep for feed. Doing this annually leeds to pollarded trees.
Gerry Beranek is right about pollarding being done annually, since you need to harvest branches every year. Changing it to semiannually or every 3rd year is most likely a later development, since the original reason for doing it has changed.Today it is done to keep trees from getting too big, since pollarded trees will grow in diameter but not in reach.
Only certain species of trees will react positively to pollarding, attempting it on other species would indeed be "topping"
So pollarding is a VERY old tradition around certain parts of the world, just because it isn't done in the US, doesn't give you the right to arrogantly liken it to "plastic pink flamingos" .