Comment by q3k

You can lease fibre/lambda/L2 transport to an IXP (and there peer with other local ISPs and get global transit from Tier 1 providers) from many companies that don't even have any residential offering.

Or if (technically/financially/legally) possible, even run your own fibre to a PoP housing an IXP on your own.

Once you're in multiple PoPs and on multiple IXPs and with multiple upstreams/peers you're pretty much independent from the whims of a single ISP.