[fiiv]

Nothing wrong with that approach as long as the user can opt out or not display the news on start if they are not interested.

If email is important to you though, maybe consider some kind of other incentive to re-sub to the email list (or sub to it in general). Maybe you allow people to get in on new beta versions, or get premium themes or templates or something (not sure what your apps do but you might have something like that).

It also depends on your audience. A telegram channel might be good if your audience uses Telegram.