PMMP is a server software that doesn't use any resources from MCPE, distributed under LGPL for non commercial use. On the other hand, what people do using the software is entirely irrelevant to PMMP itself. But keep in mind that if you use MCPE to connect to a PMMP server, you are surely affected by the EULA since you are using their software.
PMMP is short for PocketMine-MP. PocketMine-MP is a software. It is not a server. The PocketMine-MP development team is non-profit, but accepts donations. Sponsoring any one server would go against being non-profit.
depends who you ask, IMNAL, like SOF3 said, PMMP is not but MCPE is, TLDR PMMP is not, so you may throw EULA out of the window if you can develope an open source alternative that's licensed under "WTFPL", and has no EULA, therefore allowing the MCPE knockoff client to join, so even if mojang somehow blacklisted your server, the knockoff client can still use it regardless it's basically like there's only one web browser that have a monopoly on what's allowed on website, if you violate it your website gets blacklisted and now no one can visit your website, BUT if there's now two web browser, they lose their monopoly game so even if it's blacklisted people can just use the second web browser also easier to be said then done, this is very much in a theoretically possible sense, with no practicalness
I am not sure if the EULA has been updated. The last time I checked, you can terminate its effect by removing all their software from your devices. So, uninstall MCPE, manage your server with console and Specter, use a third-party application that renders a world map to manage the world, write plugins to do everything for you. Now you can ignore the EULA.