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Partly memory too, if you forget to tap out you get charged for the furthest you could've gone that day. Plus the hiviz folks who scan your card mid journey then hit you with £100 fine if you had forgotten to tap in. Yes it can catch the piss takers but also penalises forgetful / absent minded folks. I have to carry my card in my hand so as not to forget.
I also know of people who never tap in or out & only pay the fines to the hi viz folks as it is cheaper in the long run.
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https://www.bbc.co.uk/news/business-30475232
Paying the 'maximum fare' deliberately instead of a commuter rail ticket.
You know you can claim back the penalty fare if you forget to tap in/out? But only a few times a month. It's easy with an online oyster/tfl account, even if you pay by bank card.
Its based on honesty .