That's my main problem really, I have Spotify, WhatsApp and a couple other closed-source applications on my smartphone that I need in order for said phone to be useful. If there are no ports or alternatives maintained on the Librem I'd just be buying a very expensive paperweight. And I don't think I'm a heavy app user compared to most of my friends who often have a couple social network apps, games etc...
Sibling comments mention that MS could probably make a profitable phone but they don't have the same objectives and I say that it's irrelevant. The problem is third parties and app supports. I need my phone to do more than calling and texting these days, I need decent driving directions, a multimedia player (ideally something that interfaces with Spotify, but I know that's asking for a lot), a chat application that can connect to WhatsApp (I won't convince all of my contacts to switch to Signal, Jabber or IRC) etc...
I need that stuff to be maintained and updated for at least a few years. And ideally after that I'd like to know that I can count on a Librem n+1 being available so that I won't have to change ecosystem once again.
I've bought a few open source/homebrew systems over the years, mainly handheld consoles to run emulators. It works but the software is often rather lackluster and very amateur looking. It's also generally maintained for a little while then the contributors move on to something else. It's fine for a toy emulator console, not so much for a smartphone.
The hardware is not the issue, the ecosystem is.
Most non-technical users don't care about updates, their care about their low prices for pre-paid phones and the respective monthly expenses.
I doubt the Purism folks are unaware of this, but I think this running a standard GNU/Linux stack as opposed to what Ubuntu Touch/Firefox OS were doing, gives it at least a shot.
I'm sure Microsoft would've no problem making profitable phones, but if their goal is to obtain as many users as possible, as fast as possible, by spending millions upon millions on marketing and other endeavors then it becomes a lot more difficult.
Windows Phones and countless other smartphone environments floundered over the years even though they were backed by behemoths. What chances does Purism have?
So while I have absolutely no hostility towards the project I just don't think it's worth donating money to what I consider to be a lost cause. I'd rather donate money to other Open Source projects who I think will make better use of it.
I would be very glad to be proven wrong however, the current smartphone ecosystem is an absolute nightmare if you value privacy and having control on your hardware. If it turns out that the Librem 5 is not dead on arrival like I presume it will be (assuming that it even manages to arrive in the first place) I'll definitely consider buying one.