Yeah, but can you post events anonymous there? I tried it a couple of Years ago and i didnt See that Option. But maybe that changed since then.
Also it seems Less active for my country (germany). In my area there is a instance called https://bonn.jetzt/ which is quite active and is also posting on Mastodon.
There are some Sites which do this thing: https://alternativeto.net/software/rebrickable/ .
But sadly they all are properitary and all of them Seem to cost a few dollars for alternative building instructions.
There are plenty selfhosted alternatives, where your location-data can be stored and shared on/from your own hardware, like Hauk: https://github.com/bilde2910/Hauk .
In my experience shit just works in Linux. I own an 10+ year old external DVD-Drive and an newer external BD-Diskdrive. And both of em work flawless on Manjaro.
I simply love the Dutchs for their OpenSource-Mindset! I am pretty confident, that they will take the right decisions.
Personally i would like to See the Dutchs taking the lead in EU-Digital-Decision-Making.