i think text marketing is the optimal way to reach maximum people in short time with low budget.
...You seem to be operating on the basis that this is Facebook, or some other platform filled with dreamers and wannabes; a few of whom might be dim enough to buy into this nonsense.
Firstly, SMS SPAMMING is now-ancient news... I first saw it floated when mobiles phones started to move from analogue to digital somewhere around 20 years ago. It got an angry reaction then, as it does now... As did 'bluejacking' when it ejaculated onto the scene. On that basis , it's frankly dishonest to try and associate it (as you have) with 'trendy young things living the life virtual with their apps and their iPhones. Or indeed as something 'new' that people simply haven't 'discovered'.
Secondly, you're STEALING... In much the same ways as unwanted tele-marketers do, you're stealing people's time. - Not making a polite request for it; not trying to draw attention, you're crashing your way into people's lives - the vast majority of whom - don't want you there.
What that does is DAMAGE the reputation of whatever it is you're selling and of you, yourself, as a marketer.
Here's a comment from the TPS on the subject:
http://www.tpsonline.org.uk/tps/mobile/unsolicitedtextmessages.html
Thirdly, as the GDPR kicks in it's going to become increasingly difficult to do legally... So, expect people who buy into your 'service' to start getting prosecuted.
Fourthly - this pidgin statement; "93% of sent messages opened and read by the people.." ...is both unreferenced and vacuous. The plain fact is that on many phones you have to scroll through a message list to delete them, and this will retune a 'delivered' tag to the user; in fact some phones/systems do that as soon as it reaches the inbox! - Meaningless!
what will you do when you are organizing an event on urgent basis or offering something for limited period? what method you use to spread the message or news?
...Any one of a few-dozen things that legitimate marketers do without enraging the majority of people who encounter the marketing message.
The reference about sailing up the Clyde on a banana skin obviously went straight over you head; so I suggest you go look it up!