I believe so, I do not mind paying for ease-of-life services.
But with a good documentation on deploying Elixir/Phoenix releases, it should be very easy to host on a VPS. For example, a release with erts included boils down to a bash script with the start, stop etc. commands, basically.
Although there are some services that provide non-root VPS, or maybe Docker hosting, Proxied hosting, etc. I agree that it is an important point to consider.
I do not sayt that there is not a place for Render and Gigalixir (which I use) but their service/cost ratio seems very high to me.