I would assume the metric isn’t number of transactions, but total transaction value. It’s really uncommon to pay for really expensive things (e.g., houses, cars, boats) in cash, and doing so almost always means that the duffel bag of cash came from shady means.
OK, but look at the original statement, that cash is mainly used for illegal activities. I do not think that is true.
Now, check this out:
> Cash was the most frequently used payment method at the POS in the euro area and was used in 52% (59%) of transactions, but the share of cash payments has declined.
> Cash was the most frequently used payment method for small-value payments at the POS, in line with previous surveys. For payments over €50, cards were the most frequently used payment method.
> Cash was the dominant means of payment in P2P transactions, accounting for 41% of such payments. Cards and mobile apps were used for 33%, credit transfers for 9% and instant payments for 6% of P2P transactions.
https://www.ecb.europa.eu/stats/ecb_surveys/space/html/ecb.s...
This is to be expected though:
> The most frequently used instrument for online payments was cards, representing 48% (51%) of transactions. The share of e-payment solutions, i.e. payment wallets and mobile apps, was 29% (26%).
> The large majority of recurring payments were made using direct debit, with credit transfers ranking in second place.
Regarding privacy:
> A majority of euro area consumers (58%) said they were concerned about their privacy when performing digital payments or other banking activities.
I think they genuinely care about privacy and are not thugs.