I see where a comparison table would be useful here. Unfortunately, that's something no LLM is going to give you.

I looked for independent reviews on action1 and found this: https://community.spiceworks.com/topic/2186911-action1-anyone-using-it

It does suffer from being rather long, so maybe it's not going to be helpful.

It's hard to find someone who is willing to review or try out multiple options and then write a concise, unbiased comparison guide of even just the features, let alone specific to privacy and security.

This is one of those places where I expect many people would be willing to pay some small for such a guide, and there are even micropayment paywall systems that could facilitate that, but there's the huge marketing burden if getting the word out about said guides. So maybe this wonderful review writeup already exists but we don't know about it.

If there's something like this out there, I'd totally write up a guide on any of the privacy/security topics that I know well, such as secure messaging services. If it sells, I'd be willing to do more thsn just one. But I'm not willing to do the marketing around such a platform. I'm already stretched kinda thin.