This one isn't about carbon emissions. It's about plastic waste. It says so in the article:
“New Zealand produces too much waste, too much plastic waste,” said New Zealand’s associate environment minister Rachel Brooking.
With respect to how many times people use alternatives: that just comes down to cost and durability. Someone might not re-use a bag 1000 times if it costs $0.50 to buy it once. That's a lot more likely if the reusable bag is $5.
Reddit hasn't had their IPO yet. The only way that regular people are invested in it are by being invested in equity firms that own part of Reddit today. As best I can tell, the only one such company that (a) is invested in reddit, and (b) is public is Tencent.
So, for now, people are safe. It's investment managers at private businesses that might get in trouble.