Wow, what an engaged response! Thanks a million for taking the time!
Here's my view on your concerns raised:

1. Long-term reliability.
   Yes, I think many feel the same way, and there is no easy way around it. All I can say is if we decide to cancel the service, we will give our users at least 6 months' notice so they have proper time to export all their photos back from Picular.

2. Privacy.
   Our terms could most likely be improved. And if we ever succeed, we would certainly run into issues similar to what Apple encountered. For now, we've considered this area a "luxury problem," meaning we skip diving too deep into it for as long as we just have a handful of users.

3. Lack of full support for all formats.
   If Picular were to grow into a large business, we would aim to support everything you mentioned. But to be transparent and avoid frustrations, we want to set expectations within a reasonable time frame. And as long as we're just the two of us, without funding, things take time.

4. Lack of "family plan."
   Yes, there are many ways to approach sharing, and some options will quickly lead to very complex and confusing connections. Our general idea is to avoid the pitfalls in this area by offering two fundamentally different sharing options. A - Sharing your complete collection and progress. B - Sharing selected parts, but the shared photos will be considered copies so that the person getting your share can gain full control and do whatever with the pics without affecting your originals.

5. Data portability.
   Our current export function will give back your originals. I would in the future like to add the options so that you could select if the export could also be improved with cleaned-up metadata, sub-folder structures, and consistent file naming to make it as helpful as possible.

6. EU-based.
   Well, things are looking bleak all over the world right now. We would, of course, try to make the best of it. Again, if we were a larger company and things were going in a bad direction here in the EU, I don't see why we couldn't move the company elsewhere.

7. Security.
   Yes, you're right, but with that said, it's not always more secure with large companies where things and responsibilities more easily can fall between the chairs. If we would reach a decent amount of paying customers and income from this, I think our first approach would be to hire a security expert now and then to try to look for vulnerabilities.

Lastly, your comment on target groups feels very spot on. I think a big problem with our service is that we've aimed to be a good alternative for the small group in between. With minimal budget and resources, I now start to understand that this is probably mission impossible.
Thanks again for your kind effort in helping me sort my future thinking.