; (2) to subdivide or segment consumers of online services into groups for the purposes of covered research, except with the affirmative express consent of each user involved; or (3) to design, modify, or manipulate a user interface on an online service, or portion of a user interface or online service, that is directed to a child or teen with the purpose or substantial effect of causing, increasing, or encouraging compulsive usage, including using video auto-play functions initiated without the consent of a user. (b) Duties of large online operators Any large online operator that engages in any form of covered research based on the activity or data of the users of the large online operator shall do each of the following: (1) Disclose to its users on a routine basis, but not less than once each 90 days, the general purpose of any such covered research to each user whose user data is or was subject to or included in any covered research during the previous 90-day period. (2) Disclose to the public on a routine basis, but not less than once each 90 days, any covered research with the purposes of promoting engagement or product conversion being currently undertaken, or concluded since the prior disclosure. (3) Present the disclosures described in paragraphs (1) and (2) in a manner that is— (A) clear, conspicuous, context-appropriate, and easily accessible; and (B) not deceptively obscured. (4) (A) Subject to subparagraph (B), remove and delete all user data obtained from affected users in the course of covered research if the large online operator— (i) determines (or determines that it has reason to believe) that the affirmative express consent required under this section from such users was not acquired