I guess it would feel less intrusive if it weren't four spaced out lines where most comments are one.

Regardless, even if it's for a good cause, it is an advertisement. It's informing users of Piped for the purpose of getting them to use it. Existing Piped users already have a convenient way to set up redirects, which have been posted several times.

I guess it seems a lot nicer to people who actually want to use the service, but to people who don't, it's just advertising.