There are no time limits. The complexity may be a problem now, but later the collected data will reveal anything they want about you.
Yes there are, eventually you need to make a decision about whether to let this person into the country
Data (even encrypted data) is being collected and stored today. It is decrypted/made sense of whenever technology has reached the required maturity. At that moment, we become 100% open books. And you may feel that at the border (or elsewhere).