There are always ways to talk directly with your intended users/customers--without going the open-access-to-all-landing-page route. Identify 20, 50, or 100 specific people who you think would be ideal customers, talk to them, show them your super-rough & ugly MVP, and get feedback. Getting out of the building & talking to potential users will shortcut your time, prevent missteps, and quickly show you whether your idea has potential or if you should kill it.Go outside, and, on hands and knees, beg the deities above to confirm or deny that I'm not building a piece of shit.
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But in all seriousness, it would be to have a landing page that excepts email addresses in exchange for some kind of early access or notification about the release of the app. But that again makes me nervous because of copycats. Maybe I just need to let that go, idk.