It's not about KYC when buying, it's amount at which centralized exchanges must ask you to which wallet are you sending bitcoins, is it your wallet, etc. And AFAIK I can accept also same way for goods and services on a company, just write invoice / receipt, like with cash (which is kinda KYC anyway). But I might be wrong here in details. In any case, "travel rule" kinda does not affect payments between two non-custodial wallets and likely does not affect non financial institutions or institutions under MiCA. Then again, limits on accepting cash for legal entities in Latvia is few times bigger. When somebody finally will want to pay in bitcoins to my company, then we'll see. Some time ago one guy did presentation about buying real estate with BTC here, AFAIR buyer just needs to prove source of funds, that he had legally earned X amount, not something about specific UTXO from which you send coins.