Why do you think website operators want to place those third party cookies on your PC?
There's only one legitimate use for them, which is for ancient corporate login workflows that shouldn't exist anymore. Every other use of them generally is just for targeted advertising, and with it sale of data, or using them for internal analytics.
Usually they don't really mention the selling data part upfront; it's hidden somewhere in the giant modals that they make you click through. There's also the related problem that Google is an information guzzler, and anything that enters it's ecosystem has a chance to get used by them for advertising, meaning that these giant modals also get shown for webpages that use Analytics. That last one is how you often see sites without ads get those giant modals.
Arguably they should've been blocked by the user agent years ago, and Mozilla has already done so. Google however cannot do so with Chrome because of their conflict of interest in the ad market; the UK has determined that if Chrome kills third party cookies, all their replacements would just punt Google into unfair competition. It's probably the strongest argument I can think of as to why Chrome should be split off from Google - a browser that cannot meaningfully protect a user against bad actors because of the operator being a monopolist bad actor shouldn't be used at all.
Mere (same site) login cookies require no modals or confirmation since the user implicitly consents to them when they authenticate (most users expect their login to be preserved when they changes pages and/or reload the site.) That said, it's still considered a courtesy/good practice to inform users before placing them regardless.
There's only one legitimate use for them, which is for ancient corporate login workflows that shouldn't exist anymore. Every other use of them generally is just for targeted advertising, and with it sale of data, or using them for internal analytics.
Usually they don't really mention the selling data part upfront; it's hidden somewhere in the giant modals that they make you click through. There's also the related problem that Google is an information guzzler, and anything that enters it's ecosystem has a chance to get used by them for advertising, meaning that these giant modals also get shown for webpages that use Analytics. That last one is how you often see sites without ads get those giant modals.
Arguably they should've been blocked by the user agent years ago, and Mozilla has already done so. Google however cannot do so with Chrome because of their conflict of interest in the ad market; the UK has determined that if Chrome kills third party cookies, all their replacements would just punt Google into unfair competition. It's probably the strongest argument I can think of as to why Chrome should be split off from Google - a browser that cannot meaningfully protect a user against bad actors because of the operator being a monopolist bad actor shouldn't be used at all.
Mere (same site) login cookies require no modals or confirmation since the user implicitly consents to them when they authenticate (most users expect their login to be preserved when they changes pages and/or reload the site.) That said, it's still considered a courtesy/good practice to inform users before placing them regardless.