Bitcoin has use cases. It can be used for transactions that are fast, secure, and lower fees compared to what is offered by Paypal, and other payment platforms. Moreover, for anonymous transactions, Bitcoin is very appropriate because it is anonymous and does not require the sender's personal data.
It's true that it doesn't give profits to the company directly, but if a company wants to send transactions internationally, but doesn't want to be tracked by the government, they can use Bitcoin which will benefit them or they can invest long term in Bitcoin and get profit from that. So you are quite wrong in stating that Bitcoin has no use cases.