Ouch.
well, clearly riot is turning poppy in the counter for mobility.
cant wait for them to release every new champ with unstoppable dashes included.(or a way to cleanse grounded) knowing Riot they will do exactly this, if not then it means that they learn at least from SOME of there mistakes. (like making mobility far to accessible in the first place.)
Katarina is 100% unaffected unless she pulls a lantern or uses rocketbelt.
Eat poopies and die, you hypermobile wieners!
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isn't effected by it actually. Her's is a blink, Poppy's W only stops dashes.

in jg, 
in lane, and
unable to dash into their allies all get majorly impacted though.
Katarina does get affected... Her E gets stopped by grounded effects like cassiopea and singed...
Isn't Kata's E a blink though?
Hey, you gotta take Kat of your list. It only grounds you after it blocks your dash, so it still doesn't do anything to Katarina's blinks.
does grounding affect riven's Q ?
Poppy W grounds now? Where's the source? I NEEEEED the source!
I've been telling people to pick poppy into mobile champs when they're meta since forever. I feel like riot is using this as a wake up call for people who complain about mobile champs but never take the time to try and counterplay them.
Won't matter anyways because Poppy gets steamrolled in toplane by meta top laners like Darius, Morde, and Aatrox while being useless as supp in botlane as well because of how poke prone she is and her CC early is nowhere near as good as Pyke/Thresh/Rakhan while having none of their trading tools against ranged poke or offering shields or extra gold to the adc.
They can buff tank utilities till cows fly. You can make Maokai ult an instant aoe root and his Q apply grievous wounds and it would make zero difference because if you can't make it out of laning phase without massive CS and xp deficit from being zoned out of CS by champions you can't 1v1, no amount of utility buffs will matter. You'll still be 1-2 levels down, 1-2 items behind the enemy top laners and completely useless as a result when contesting objectives or skirmishes, let alone split pushing.