> A regular provider charges a regular commission but will not work with you, while another will want a commission 10 times higher and will agree, but may stop working with you at any time.
I know I will get downvoted for this because it is an unpopular opinion, but this exactly the reason why we need bitcoin as a means of payments without any middlemen involved.
Yes, because bitcoin transaction costs never surge in price.
The miners are the middlemen, and they can chose to take your transaction or not. Should bitcoin ever be actually used for payment, it's not to too far fetched to think miners could be forbidden to validate transactions involving a blacklist of addresses...