I don't do much except reading on mobile so can't comment from that perspective. On desktop youtube shorts is just toxic. I keep clicking the X to get rid of them but that only works for 30 days. I often just close my browser tab now if I scroll and see a row of shorts.
I want nothing to do with shorts. If a video isn't long just have it play in the regular video player. There's also no valid reason to encourage people to shoot vertical video, it hurts my brain. The absolute worst though is there being no volume control. Love having my ear drums wrecked if a short opens up.
Not if they track this server-side, then you just get banned or can't open any more videos after 3 videos, and won't have the message telling you why.