Museum refused money to buy tickets

i've seen places like this in Brussels, yes it is beyond bizarre.

Commonplace and not only in Brussels or Belgium.
Places do not want to have cash which can be stolen when credit/debit cards are so widely available.
Telephone boxes - where they still exist - usually will no longer take cash. Go to the CT and there are notices asking that payment is made by plastic rather than cash.

It is legal; there is no law in Belgium stating that the businesses must accept cash as payment; they are free to decide which payment means they accept. It''s less common in Belgium but very common in the Netherlands for example. There you see all over the place shops etc. which have a notice in the window that they do not accept cash, only cards. In Rotterdam, the Euromast, which is the most popular tourist attraction there, has a "card payments only" policy and has had for years.

Well....apparently organizations which do this claim that they are trying to avoid a robbery threat, but I don't accept this. I believe that any place that won't accept cash is mostly worried about employee-theft. Only in Belgium does this peculiar situation seem to exist.

Even the buses accept cash and will give change up to 5€...

" Only in Belgium does this peculiar situation seem to exist."

As Kasseistamper and rppkn say, it's common practice in other countries too.

If they don’t have the facilities to store cash why should they create one just for people convince. I mean why do people think it is such an issue cash requires banking and safe storage and in this day of smart phones seems perfectly fine to me.
I’m really just puzzled it’s even a question

"Even the buses accept cash and will give change up to 5€..."

In Belgium, yes and for now. Go to London and the buses don't accept cash, you have to either use a contactless bank/credit card or buy an Oyster Card and preload that with credit.

So....I don't understand why some of you people think that it is normal and fine to not accept cash. What if some young teenagers want to go to a Museum....I must give them my debit card instead of simply some money? No, a system that doesn't accept cash is an Orwellian System that I wish to have no part of, I can't wait for the day the government implants RFID chips in newborns in the Maternity ward of the hospitals.

I still think the REAL REASON is that museums etc... are afraid of Employee Theft. For example...in Brussels...the Royal Museum of the Armed Forces and Military History won't accept cash for the 5€ entry fee....but 5 meters from the "cashier" the gift shop will eagerly accept your cash..... ¿¿¿¿¿¿¿