If you live in the US, your carrier likely offers an app that will prevent spam calls from ringing and spam texts from delivering. It may cost a couple bucks (USD) a month or may be free. AT&T ActiveArmor is absolutely superb at blocking spam calls and texts and I notice the crazy increase in spam every time I turn it off or leave AT&T. The premium version comes free with AT&T Unlimited Premium and AT&T Unlimited Elite (for those that still have it) and is I think a $3.99 /mo add-on for other plans. There is also a free, less robust version, available to users on cheaper plans as well. But to answer your question, carriers already can. It’s your job as a customer to decide if you want to let them.