Will a person be rewarded for opening scientific, historical, or Islamic channels, supporting them with multiple accounts, disabling comments, and adding likes, without revealing their identity?

Opening a channel and showcasing good content on it is a commendable act for which one will be rewarded, provided it is free from prohibitions. However, your promotion of the channel by stating that you are its owner is a form of boasting about what you do not possess and appearing to have been given what you have not been given, which is blameworthy. Therefore, strive for sincerity to Allah and excellence in work; for these are two main reasons for the blessing of knowledge, its spread, and people benefiting from it.