spamcomment.user.js

// ==UserScript==
// @name           BitcoinTalk Poor Comment Blocker
// @version        1.0
// @description    Removes comments with ads in signature on the https://bitcointalk.org forum.
// @include        https://bitcointalk.org/index.php?topic=*
// @require        https://code.jquery.com/jquery-3.3.1.min.js
// @run-at         document-end
// ==/UserScript==

/*
 * Define block words here. Each item is a regex. Case is ignored.
 */
var blockWords = [
    "telegram"
    , "whitepaper"
    , "discount"
    , "\\bjoin\\b"
    , "be part of"
    , "pre-?sale"
    , "\\bico\\b"
    , "token"
    , "empower"
    , "casino"
    , "fortune"
    , "\\bdice\\b"
];

blockWords = new RegExp(blockWords.join("|"), "i");

$(".signature").each(function () {
    var $this = $(this);

    if (blockWords.test($this.html())) {
        hidePost($this);
    }
});

insertCss(
    ".hidden-post-container {"
        + "background-color: #ECEDF3;"
    + "}"
    + ".hidden-post-inner {"
        + "opacity: 0.05;"
        + "transition: 0.2s opacity;"
    + "}"
    + ".hidden-post-inner:hover {"
        + "opacity: 1;"
        + "transition-delay: 0.5s;"
    + "}"
);

function hidePost($signature) {
    $signature.parents("td.windowbg, td.windowbg2").addClass("hidden-post-inner").parent().addClass("hidden-post-container");
}

function insertCss(css) {
    var style = document.createElement("style");
    style.type = "text/css";
    style.innerHTML = css;
    document.head.appendChild(style);
}