Yet, new PaaS keep coming up. Some recent ones which caught my attention are - coolify.io, porter.run, ubicloud.com, etc.

Can someone who uses PaaS explain what's the rationale behind this? Which use cases are these new PaaS solving which the previous ones failed to solve?

Eventually, it seems like all these companies want to start as PaaS but get into end-to-end cloud business (including their own hardware).

Can you also comment what is preferred these days - coolify.io, porter.run or ubicloud.com - with pros and cons? If pricing is significant part of the game, how is their positioning different from cheaper clouds like Vultr.com who are also building their PaaS layer but has advantage of end-to-end control over hardware layer too?

I guess I asked more than one question but greatly appreciate an insightful answer which can help me understand this. Thank you so much.