Why is there little defence against technically complex OTP interception schemes?

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There is little defence because OTP interception depends on compromising phone networks and accessing OTPs through complex technical attacks
OTPs are one-time passwords used to verify a login or transaction, typically delivered by SMS to a phone number. In SMS diversion scams, attackers compromise phone networks so they can access those OTPs, and this kind of network-level interference is difficult for individuals to detect or stop. The same applies to other highly automated fraud methods, where attackers can operate at speed and scale in ways that are not visible to the phone user.
Why OTPs are hard to protect when the phone network is compromised
OTPs are designed to be valid only once, which is why they are commonly used for security checks in banking and account access. However, when scammers are able to compromise phone networks, the OTPs intended for a victim can be reached by the attacker instead. Because this involves the communications infrastructure rather than just a user clicking a link, the victim has limited control over what happens to the OTP after it is sent.
Why the schemes are described as complex and technical
The fraud described as SMS diversion/hacks is framed as a technically complex process that allows access to OTPs. Individuals can be cautious about calls, SMS messages, and emails, but the interception mechanism relies on attacker capabilities that go beyond ordinary social engineering. In that setting, even careful behaviour may not prevent OTP access once the network pathway is manipulated.
Why detection is difficult for ordinary users
The fraud environment is portrayed as continuously increasing in sophistication, with scams occurring on a daily basis. OTP interception through network compromise is not something a user can easily see or verify in real time, because the OTP is already generated and delivered as a normal security step. That invisibility reduces the practical ability of individuals to respond before funds or accounts are affected.
Why telecom and bank involvement is highlighted as necessary
The information emphasises that the problem is beyond police action alone and that active support from banks and telcos is needed for any real solution. It points to telecom networks and banks whose infrastructure is often used to perpetrate scams, and it argues that these sectors must be under more pressure to combat criminals. In practice, this means defences must target the parts of the system that enable OTP access, not just the messages that reach end users.

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Why is there little defence against technically complex OTP interception schemes?

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