is there a reason to be wary of sidestore? first time i've heard of that but seems like a legit opensource project. doesn't seem like it would be a project that is all that lucrative for bad actors... people that don't want to pay $99/year to load apps on their personal iphones/ipads doesn't seem like a big score.
I believe they had an issue early on where some Apple IDs were getting soft-locked but said issue has been resolved for a few years now and it's easy to make an Apple ID specifically to use with SideStore.