Yes for all these claims, we would need very specific information. For security issues, our policy is that any claim must come with a proof of concept, otherwise we simply can’t do anything about it. We take security issues very seriously and do our own checks, but if you make claims then the burden of proof is on you, otherwise we can’t make the difference between a real issue and a user spreading FUD (which unfortunately is quite common).
As for transparency, we have a privacy policy, which is linked to in various places including app stores: https://joplinapp.org/privacy/ We don’t track any user activity and collect no data.