As I know, mining bitcoin is the risk you get lost if don't have a good source.
but on social media, I always see everyone or the company share and sell the tool you will get a profit if use it.
First of all what we see over internet and social media is not always right and most of these lucrative offers are just another way to attract people but when you get into the depth you come to know about the true picture.The mining profits is made by the pools who have huge mining farms and get rewards of 6.25
BTC which is not possible with these small tools.
For example; bitcoin merch, as they sell it for beginners and look friendly; just plug in a USB to a PC then the beginner can be mining the profit.
Do you think it's this easy to earn profits with bitcoin mining when the prices are trading at $20k so you would be having easy gains with these machines? You can be part of mining community with it but making profits is entirely different case.You need to differentiate between the both.
is the company know what the risk is if they sell it to anyone especially a newbie who doesn't know anything about mining?
They are into the business of selling these machines and for them when you are spending money on it you have the knowledge and need to use it so we can't blame them.As @Welsh said above they can provide you with manuals guiding you how to operate the machine and set it up but you are expecting too much from them.The risk associated with mining has nothing to do with them as you buy any tech from market without analysing what's the use and risk associated with it we can't blame the manufacturer and for them you are customer not any newbie so you should be responsible for knowing all the details before hand.
See there are lot of factors which you need to consider before jumping into mining or say will determine your profitability like :
1) The cost of electricity in your country as you need to have the machine constantly running so high cost will reduce the profits and vice versa
2) The initial investment and time to recover the cost because the actual profits will be after you have recovered the initial cost
3) The maintenance of the system also includes in cost of mining as due to heating some parts may get damaged and needs replacement or maintenance
There are many other factors but if you believe you can start making profits with spending less amount and early then you have no knowledge of the current mining conditions so have your research about it first of all and then see how it actually works.