There was a time when you simply expected to pay for anything that had value. Whether that was a newspaper, a magazine, a movie, music, or even an online service like AOL or CompuServe, you paid for it and you expected a certain level of quality in return.
In the early days of the Web, it wasn't clear at all that sites could pay their bills with advertising. Then in the mid-'90s, Ethan Zuckerman invented the pop-up ad (he's apologized since) and things progressed - or regressed, if you prefer - and we slid down the long slope to companies selling your data, hyper-targeting ads, and worse.
So many of society's ills right now can be traced to the ad-driven model. It's why clickbait is lucrative, why it's more profitable to run a populist site filled with misinformation than a trustworthy news org, it's how scammers and spammers are incentivized to flood social media sites with slop.
I'd love to see Kagi succeed, and others to follow their lead. I'd much rather spend an extra $20, $30, even $50 a month or more to subscribe to a bunch of ad-free sites that I can trust than to get it all for "free" at the cost of ads, data mining, and scammy clickbait.