If the other business is smart, they won't let you acquire them at all and will force you into a B2B pricing package. Obviously you demand their product and are

If the other business is smart, they won't let you acquire them at all and will force you into a B2B pricing package. Obviously you demand their product and are willing to pay a high fee; sounds like a perfect time to bait you into a contract. Unless you buy them out for a ridiculously eye-watering price, I don't see how this could work well. At founder-scale you should be focusing less on mergers & acquisitions and more on building your product. A good place to start would be engineering a contingency plan if you can't acquire said company.