As explained by Thelone1986, these are companies that offer home cleaning or ironing but also help for disabled people.
The payment method is also quite special. The customer does not pay with money but with “service vouchers” which he purchases from the Walloon Region for a value of €10/piece. For each “service voucher”, the company also receives a subsidy from the Walloon Region in the amount of €17.
To find out more about the system see https://titres-services.wallonie.be/ The same system also exists in Brussels and Flanders.
There are not many of these stores mapped on OSM, but there are several thousand companies of this type in Belgium.