Okay I got an anon zap, so I'll take it.

Few things.

Vienna, overall, doesn't have the same level of merchant adoption you'll see in Prague or even Munich, but there are a few places. Check out nostr:npub1hkuq059m2ltk03d8m6292jhe6srcg47rv3xzqf482d8qwl9sccxq8ug4dr here, as well as a few Latin American cafes and restaurants on nostr:npub1864jglrrhv6alguwql9pqtmd5296nww5dpcewapmmcazk8vq4mks0tt2tq

https://btcmap.org/map#13/48.22021/16.38834

Austrian capital gains tax is insanely high (27.5%) for any BTC bought after 2021. If you use any of the major exchanges based in Austria (Coinfinity, Bitpanda) they'll automatically collect this tax if you sell through there.

When it comes to MiCA, most of the Austrian-based firms have already committed to following this, and already do tons of KYC, so I don't think this will change much.

If you mean "living" on BTC, likely the best way would be to use platforms like nostr:npub1krveufv8unj22udw0tjngv8f0g3zdjdz64kx3dztw9tkl8r66tzq0fd3py or nostr:npub1m7r9aayrqjtt2q0whkyrwlys75s5d828c5uewvqwyfd2kxefkfjqgeny2w which you probably know. These platforms do use KYC, so you'll have to submit an identity document and could be on the hook for taxes if your tax residency is Austria. But for spending sats and their debit cards (or gift cards) the solutions they have are pretty good.

https://spend.bringin.xyz/signup?affiliate=XKU41UZUPU

For the few merchants I personally use that are usually small companies (barber, butcher, etc.) I've been moderately successful at getting them to accept Bitcoin, but nothing super official.

Obviously, the meetup community is great here, either Bitcoin Austria or Einundzwangzig Wien. I regret that I'm not able to join more usually because I'm traveling.

Hope this helps and happy to answer any other questions!