Cramer's week ahead: Earnings from Dell, CrowdStrike and several big retailers Bluesky's U.S. mobile app downloads have skyrocketed 651% since the start of November, according to estimates from Sensor Tower. In the same period, X and Meta's Threads are up 20% and 42%, respectively. X and Threads have much larger monthly user bases. Although Musk said in May that X has 600 million monthly users, market intelligence firm Sensor Tower estimates X had 318 million monthly users as of October. That same month, Meta said Threads had nearly 275 million monthly users. Bluesky told CNBC on Thursday it had reached 21 million total users this week. Here are some of the noteworthy changes in X's new service terms and how they compare with those of rivals Bluesky and Threads. Artificial intelligence training X has come under heightened scrutiny because of its new terms, which say that any content on the service can be used royalty-free to train the company's artificial intelligence large language models, including its Grok chatbot. "You agree that this license includes the right for us to (i) provide, promote, and improve the Services, including, for example, for use with and training of our machine learning and artificial intelligence models, whether generative or another type," X's terms say. Additionally, any "user interactions, inputs and results" shared with Grok can be used for what it calls "training and fine-tuning purposes," according to the Grok section of the X app and website. This specific function, though, can be turned off manually. X's terms do not specify whether users' private messages can be used to train its AI models, and the company did not respond to a request for comment. "You should only provide Content that you are comfortable sharing with others," read a portion of X's terms of service agreement. Though X's new terms may be expansive, Meta's policies aren't that different. The maker of Threads uses "information shared on Meta's Products and services" to get its training data, according to the company's Privacy Center. This includes "posts or photos and their captions." There is also no direct way for users outside of the European Union to opt out of Meta's AI training. Meta keeps training data "for as long as we need it on a case-by-case basis to ensure an AI model is operating appropriately, safely and efficiently," according to its Privacy Center. Under Meta's policy, private messages with friends or family aren't used to train AI unless one of the users in a chat chooses to share it with the models, which can include Meta AI and AI Studio. Bluesky, which has seen a user growth surge since Election Day, doesn't do any generative AI training. "We do not use any of your content to train generative AI, and have no intention of doing so," Bluesky said in a post on its platform Friday, confirming the same to CNBC as well. Liquidated damages Another unusual aspect of X's new terms is its "liquidated damages" clause. The terms state that if users request, view or access more than 1 million posts – including replies, videos, images and others – in any 24-hour period they are liable for damages of $15,000. While most individual users won't easily approach that threshold, the clause is concerning for some, including digital researchers. They rely on the analysis of larger numbers of public posts from services like X to do their work. X's new terms of service are a "disturbing move that the company should reverse," said Alex Abdo, litigation director for the Knight First Amendment Institute at Columbia University, in an October statement. "The public relies on journalists and researchers to understand whether and how the platforms are shaping public discourse, affecting our elections, and warping our relationships," Abdo wrote. "One effect of X Corp.'s new terms of service will be to stifle that research when we need it most." Neither Threads nor Bluesky have anything similar to X's liquidated damages clause. Meta and X did not respond to requests for comment.