What does the recruitment company mean by "providing accommodation"? Does it mean "free room and board"?

Generally speaking, it won't be free, otherwise they will definitely advertise.

Ps: Look at these so-called classified information websites by yourself. Everyone can advertise and claim to be hiring, and give a little money to make the liar open his eyes.

Can you think with your toes a little bit, is this information more reliable than the telephone poles on the roadside?

If they are really legitimate companies with normal industries, why can't they even get the money to send job advertisements through formal channels, but also use this classified information website that claims to be free to fish in troubled waters?