I had never heard of Bolt before today that I can remember but since I'm woking on a project that needs CC processing (it has Stripe currently, I'm moving to another provider) I was interested. I looked at their website and immediately felt like it wasn't aimed at me. I don't care about 1-click anything, I want to know about how to use this, api calls, how to capture an auth, etc. I see the developer menu item and I click on "Get Started". Immediately I'm shown a list of plugins for CRM/e-commerce-type tools which, and maybe this is elitist, but that's turn off for me. Don't get me wrong I cut my chops on WP/Drupal and the like but it been a long time and I want docs with an API call to charge a card or similar. I see the "API" and "SDK" in the sidebar and check both out. API docs are swagger, that's fine, but it's not clear at all and the "workflow" to charge a card is. I go look at "SDK" and they only have an iOS SDK, is this a joke? Not to mention that it looks like you need to bring your own payment processor [0] and "The processor implementation timelines average 2-4 weeks.", at this point you are better off talking directly to someone like First Data. Let's not get started on the apparent "contact us for pricing".
Bottom line: Bolt is completely uninteresting to me as a developer and the creator sounds like sour grapes in his twitter tirade. I'm glad to be moving off Stripe for way cheaper processing but I love their docs, dashboard, etc and I'll miss it. Bolt would have been discarded as not a serious competitor almost immediately had I seen it back when I first integrated with Stripe. In fact, they seem to provide something 100% different to Stripe and even have Stripe as a payment processor.
[0] https://help.bolt.com/developers/guides/processor-guides/