I don't think it's a yes or no, right or wrong kind of thing. For an independent / small developer I think there's value in self hosting your tools, but I think it would be crazy to self host a customer facing app. There's scaling and redundancy that you can take advantage that you could never come close to hosting on your own. However, for tooling like VCS and CI, I think maintaining control is extra important when you don't have any negotiating power.

For mid-sized companies where you're paying someone to maintain things, whether that's an employee or a 3rd party, I think you need to assess your tools in terms of your negotiating power and how important it is to maintain control of everything. What if GitHub bans you? I don't think I'd try to self host a customer facing app at this scale either.

I think you can be short-term successful by throwing caution to the wind and using every shortcut available, but will the first to market advantage be enough to offset the price competition of people that aren't locked in to some proprietary API gateway or WAF? For example, what if I take extra time to build on OpenFaaS and you build on AWS everything. Who wins long term? You're faster, but I have better negotiating power (ie: less costs) by threatening to switch vendors.

Or is the idea of switching hosting vendors detached from reality at this point? Is hosting cost so negligible it doesn't matter? All I know is that everything looks crazy expensive from where I am.