But I would like to point out that these days, releasing an app as mobile-only really doesn't disenfranchise that many people.
• iOS apps can be installed and used pretty transparently on Apple Silicon Macs;
• and Android apps can likewise be installed and used pretty transparently on both Windows 11 (via Windows Subsystem for Android) and on ChromeOS.
So by choosing to release an app as mobile-only, you're "only" excluding people without (even a very old!) smartphone, who are also:
• people with only Intel Macs;
• people with only Windows PCs, who are stuck on a previous version of Windows;
• or Linux users.
That's... not too many people at this point. (And most of them live so far behind the curve that they wouldn't be interested in installing some bleeding-edge mobile app anyway.)
I would guess that probably most people in that state of "no smartphone and no modern Windows/macOS/ChromeOS device", who would also actually care about installing some random bleeding-edge app, are people who are in that state by choice — i.e. they're not unable, but rather unwilling to use a mobile app, due to being extremely concerned with their privacy/anonymity.
And being that kind of person, is actually kind of incompatible with being a "member in good standing" of a matchmaking service (whether the matchmaking is for dating; for getting a band together; for finding a babysitter; for renting a condo; etc.)
Matchmaking apps only "work" insofar as they 1. can prevent catfishing, 2. can allow users to permanently block others who are harassing them, and 3. can allow users to report spammers/scammers/etc in such a way that a bad actor will be permanently removed from the platform altogether. Matchmaking apps that don't make these guarantees, end up being negative-experience generators and go down in bad-PR flames.
With the rise of botnets that use proxy IP addresses to register massive numbers of accounts on such services for nefarious purposes, the only way matchmaking services have been able to survive, is to require the user to at least complete initial registration through a device that can give a remote attestation that the user is not in ultimate control of the device — i.e. the device has a Trusted Computing Base and has not been rooted — and so the app is not being tampered with or fed false device metrics. (See also: browser integrity.)
Wanting to have absolute privacy/anonymity, is fundamentally incompatible with using a device that's able to make such guarantees.
But I would like to point out that these days, releasing an app as mobile-only really doesn't disenfranchise that many people.
• iOS apps can be installed and used pretty transparently on Apple Silicon Macs;
• and Android apps can likewise be installed and used pretty transparently on both Windows 11 (via Windows Subsystem for Android) and on ChromeOS.
So by choosing to release an app as mobile-only, you're "only" excluding people without (even a very old!) smartphone, who are also:
• people with only Intel Macs;
• people with only Windows PCs, who are stuck on a previous version of Windows;
• or Linux users.
That's... not too many people at this point. (And most of them live so far behind the curve that they wouldn't be interested in installing some bleeding-edge mobile app anyway.)