You should know there's a font designed to make reading easier, especially for people with low vision. It's called Atkinson Hyperlegible Next. It's free for personal and commercial use.
This is probably a stupid question. If it is free for personal and all commercial use... which case isn't covered by that? Could just say it is free to use.
OP just tries to be as clear and transparent as possible, because there are times when someone says something is "free to use" but then in the "fine print" they hide limitations.
It's actually on their page, so I didn't try to call out OP on that (and not saying you implied that, just to be sure) but am actually curious if that means something specific.