nothing wrong with my logic. you are screwing something up here.
you decided to use that exchange.
you decided to let the coins remain on exchange.
you decided that you don't want to stake the coins on your own.
there is no thief who found a purse. You gave the purse directly and on purpose to that "thief". (with "you" I mean the owner of the coins)
ย
the exchange delivers something to the whole community.
It provides nodes, and generates blocks for the chain. The wallets used for staking are runned by exchange, therefore the exchange pays computational power and electricity.
The owner of the coin-amounts doesn't get harmed directly. Yeah, the overall supply will increase, but that would also happen if exchange wouldn't stake.
It would be less new coins in circulation, but also with weaker network propagation of the chain.
If you don't want your coins to get devaluated over time, you have to stake them. If you decide no to stake, it's was your decision.
If exchange does not stake, others will. Will result in the same outcome.
Yeah, you can now blame the exchange about the possible security risk with this behavior. But that's a complete other thing and has nothing to do with the staking-topic.
Reputable exchanges works only for trading and transactions fees. That it is enough to cover the electricity, hosting costs, etc..ย And if some exchange is engaged in a PoS-minting, they should report about it on the title page of the exchange with a large red font. At least it'll be honest.
By the way, I'm not one of those who leaves their coins on the exchanges. I am writing this for those who think that all the exchanges are honestly not engaged in the PoS.