Not your app (since you didn't post a link) but I see many websites on Show HN missing basic information like the company address, contact person, phone number. Often it's only a [email protected], domain registered with privacy protection and obvious stock photos, sometimes fake-looking testimonials.

Number 7 on Show HN right now: https://realideas.site/, I personally wouldn't register since the only contact is an email address

https://toortl.com/about is only slightly better with links to the linkedin profiles of the founders. It is a company? Is it registered/incorporated? Do they have an office? Why no copyright notice/terms-of-serivce/privacy notice. I assume it's a hobby project.

On my own project (https://geocoder.opencagedata.com/) the footer lists tax and company registration numbers. I hope that makes us a little more trustworthly towards companies (B2B). In reality we've never received a letter other than tax related stuff.