I haven't used Kalshi, but I expected it's actually easy because it's technically a futures exchange, so it'll be regulated more like a stock brokerage than off-shore gambling.
I'm not sure about Kalshi, however on most sports betting sites you actually are betting against the house. The betting sites all have in-house models (or piggyback off other sites) that are much better at predicting odds than the general public. If someone is making money then the sites just place limits on that account so they're not losing money.
Making paper airplanes from dollar bills, and setting their backs on fire to give them jet engines, is likely cheaper and more entertaining, so if you're gambling anyway, you've already lost, period.
Cheaper, yes. More entertaining, not for a lot of people. Many play the same way you'd play a video game, with the actual stakes giving it a bigger rush. Enough that some become addicted.
If it weren't fun it wouldn't be nearly as big a problem.
There's an old phrase that says something like "Look around the table, if you cant see the mark you're it." - if you think you are not betting against the house on a gambling site, you're VERY it.