Spamming links in the replies of trending tweets has been an advertising strategy for years now. You can't open the replies to any popular tweet without immediately seeing titties and OF links. Blocking links in replies is an easy fix that they could've implemented ages ago if they actually cared about preventing spam.
But this isn't about spam. This is about kneecapping fact-checkers before an upcoming election, on a platform where the owner has expressed endorsement for a candidate. Elon doesn't want people correcting misinformation, he wants the lies to grow and fester and spread like cancer. He's already pushed Trump-tagged tweets to users who have the term blocked; he's not hiding it anymore.
The only socially acceptable use of a Twitter account these days is for encouraging others to get the fuck off of Twitter. Using a Twitter account for any other purpose is reprehensible, and cringe. Stop drinking at the nazi bar.