If you still visit 4chan, I made this userscript to strip the tracking parameter off of JewTube videos. It could be improved, but it'll do for now.

https://pastebin.com/XjB7r4FQ

// ==UserScript==
// @name *chan Remove JewTube Tracker
// @namespace Violentmonkey Scripts
// @match https://boards.4chan.org/*/thread/*
// @icon https://s.4cdn.org/image/favicon.ico
// @grant none
// @version 1.0
// @author -
// @description Remove the `si` parameter from JewTube links
// ==/UserScript==

function removeTrackingParameter() {
const links = document.querySelectorAll("a.linkify.youtube")
links.forEach((a) => {
const url = new URL(a.href)
url.searchParams.delete('si')
a.href = url.toString()
})
}

setTimeout(removeTrackingParameter, 500)