For anyone who doesn't know wtf this means, it is

Sapio provides the compatibility matrix of an Android application with bare Android Open Source Project (AOSP) devices, coupled or not with microG.

Why should I care?

You've posted a link, but provided no reason why I should click on it.

"Just sayin"

(Also, this looks like blatant self-promotion)

I had contributed before but ultimately I don't find it that useful because the app is incomplete. The concept is valuable and I like the evaluation visualization, but incomplete or incorrect data make it much less useful.

Only the latest "evaluation" of an app is saved. It was very common for me to reopen Sapio only to discover someone had assigned a different evaluation from the one I had given and my evaluation was gone.

The user should be able to add a comment saying which features don't work. Just saying "Some features do not work" is not that helpful. Some users may have tested an app more thoroughly than others and so can provide details about specific parts of the app that do or do not work.

I have relied on completely degoogled android for many years now (first LineageOS and then GrapheneOS) but I almost didn't even try because I didn't know if my apps would work. A database like this would have been very useful at the time. Hopefully it can be made even better.