Is it permissible to use a free language learning application and invite people to it, knowing that it supports homosexuals ideologically, not financially, and should the account be deleted from it, and is keeping it considered support for them?

The ruling on supporting applications that advocate for homosexuality depends on the nature of the application and how it offers its support. If it calls for or promotes homosexuality, then it is not permissible to support it by creating an account on it or recommending it to people. However, if the support is merely a principled stance by the designers without any propaganda or promotion, then it is not obligatory to boycott it, although boycotting is better.