I've given up trusting lifetime anything from the app stores now.
Mobile OSs seem to evolve so much faster, add new layers of security, lock pro features behind app store billing APIs that require the developer's account remains in good standing.
I've been burnt by three apps cutting and running now. One where the developers got their prize jobs at Microsoft and AWS [1], another where they sold the app off to another company that gave up maintaining it [2] and finally EA (enough said) [3]
[1]: https://news.ycombinator.com/item?id=46768909
[2]: https://www.androidpolice.com/2018/04/16/beyondpods-first-pu...
[3]: https://web.archive.org/web/20190116224256/https://answers.e...