The transparency of Bitcoin transactions, due to the blockchain, ensures that all movements of the currency are unique and verifiable, reducing the risk of fraud in systems. Regulatory bodies and financial institutions are increasingly encouraging and merging Bitcoin into their systems, indicating how reliable and potential for legitimate use in the business .
It's only a transparent financial institutions or regulatory system that can see the potential and legitimacy of bitcoin and use it for their business. Those currupt financial institutions find it difficult to use because it's difficult for them to do any illegal activity because everything is transparent in the blockchain. In other words most of those financial institutions that use bitcoin, are transparent and don't want to involve a third party in there activities because whatever they do is right in the blockchain with the transaction ID. So you would never come to them to lay complain hence the transaction has been confirmed and landed in the right wallet and also has been confirmed by the nodes in the blockchain.
Due to its unique financial stability companies are happy to use it in the legitimate ecosystem due to its legal rights in the country.
Bitcoin is not legal in every country. There are some reasons why company like to use bitcoin as a means of transaction, but I doubt that it is due to its legal acceptance. What about place that are not legally accepted?
The reasons I see companies may like the use of bitcoin is that:
1. it is fast easy and reliable
2. It is transparent in blockchain
3. It can be sent to anybody anywhere across the world without looking for bank account.
4 large funds questionable by bank for the reason of withdrawal can be sent at ease with bitcoin without the interference of bank.
5 companies find bitcoin interesting because of it volatility. When clients send money to the company wallet, it may increase and also decrease in value, but more advantageous when they receive btc to their wallet if bitcoin is low and there fund increases when bitcoin is high.
The only problem people don like using bitcoin for transactions is due to the transaction fee that is high.