Technically, it is safe to put money in the banks simply because it is registered under government institutions, meaning, all transactions are tracked. Bottomline is, the value or amount you have put in there would remain the same for a long period of time unlike with putting it to other digital asset. For sure you are trying to persuade people to put their funds on cryptocurrency, it would be a good idea only if they can endure possibility of losses. Putting your money in cryprocurrency will give you the opportunity to grow your fund but will also put your money at risk given that market prices are volatile or changing from time to time. Decentralized exchanges are not banks.
I agree with you, money is safe to put in banks because it is regulated by the government institutions and plus a fact that part of your money in the bank is covered by insurance but still it is not 100% guaranteed insured depends on how much you have in the bank. Exactly putting money in crypto currency gives opportunity to grow your fund at the same time a bigger risk because of the volatility of the market and no one can really control over that. So as for be i would diversify my funds not only in banks and decentralized exchanges, I would put it as well to other kind of asset that could earn a good profit in the long run like real estate investment, gold etc. for better security of my funds.