Have you read contracts, terms of services? You don't acually need to. I'll summarize 100% of those documents for you right now in an easy to understand post with no legalese.
> you own nothing
> the company owns everything
> you have no rights
> you promise not to try and exercise any right you think you have
> you agree to binding arbitration with the firm we pay, just in case you ever get it in your silly little head that you do have rights
> you cannot do anything the company doesn't like
> the company can do anything it wants whether you like it or not
> the company is not responsible for anything ever
> the company makes absolutely no guarantees about anything
> however you are liable for everything that you do that we do not approve of
That's what happens when you can alienate people from their rights via contract: alienation turns into legal boilerplate present in every single one of those documents. The only possible reason for a company not to do this is ignorance or legal liability.