Players In Custom Games

Whenever I start a custom game, people come in, post a link, then leave immediately. The link is usually to a fake Amazon website, or promoting someones YouTube Channel. I usually don't waste my time putting in the passwords, but now i am. I don't know how many people have gotten scammed falling for the Amazon links, but if Riot could make it to where you cant post links in custom games, that would be great. Or maybe a wait time when joining other custom game rooms.