This has been proven to be a fact by multiple streamers already and others. So yes, it is an undeniable fact, not just an opinion, unlike your ‘Pay to WiIiIiIiIn’ opinions.
Wrong. Mei’s Ice Wall was THE only ability with a griefing potential in Overwatch, until Lifegriefer came along.
If you do know others, then i suggest you name them instead of pulling the overused Mei card on us.