Elon Musk has announced that Twitter will limit the number of readable tweets each day to prevent “extreme levels” of data collection and manipulation of the system, Tech News Space reports.

Shortly thereafter, users began posting screenshots on the web confirming the inability to view after exceeding the message limit, including on the pages of corporate advertisers.

Advertising industry veterans say the move is hampering the work of Linda Yaccarino, who took over as Twitter CEO last month and has been trying to build relationships with advertisers who left the service after Musk bought it.

According to Jasmine Enberg, principal analyst at Insider Intelligence, limiting users’ views could be a “disaster” for the platform’s advertising business.

According to Kai-Cheng Yang, a researcher at Indiana University in Bloomington, the restrictions effectively block the ability of third parties, including search engines, to collect data from Twitter. That capability will continue to exist, but the methods will become more sophisticated and less effective.