I expect that some larger businesses may take advantage of the system and split their operations in order to be smaller so they fit into a lower category and can pay a lower rate. EG, a manufacturing company that has 180 employees may form several seperate entities. One for receiving, handling and prepping the raw materials, one for the actual manufacturing process, one for packaging, storage and distribution and one for the management and accounting end, thus having 4 companies, all of which have under 50 employees.
in Canada, and likely other places, there are a lot of part time positions, mainly because some years ago the government ruled that any employee that works more than 24 hours a week is entitled to benefits. Sick days, medical ins, pension plan, etc. Businesses reaction was to adapt to more positions of 24 hours or less.
Instead of having 10 people doing 40 hrs each, a business may have 1 full time manager, and 15 workers, each getting 24 hours a week.