This method of sending crypto through sms is already tested however every system has backdoors and supposed to be abused by hackers. So, it is up to the users. If we look sending bitcoin through address, it is also risky because there are copy paste malware who can change your btc address.
These are risk involved when your using a third party to transact, it might be helpful for the less privileged countries where the internet connection is not that great, but the problem still is what happens these third party sites undergo a major hack and the investors are not able to get their investment back, i like these options as it is not new as companies like coinbase already tried that but if you understand the risk involved you will not venture further.
How about when you use a cryptocurrency as it was meant to be used - a currency ! - the fact people only see crypto as a investment is the real reason adoption is still a far way away