@raphael
It's pretty clear, what you're offering I think. Mastodon, Matrix, Lemmy, and FunkWhale. Though explicitly naming them, with a link to descriptions may help newbies.
The price seems fair to me. Though I notice many places list prices as per-month, but bill annually. $2.49/mo (billed annually) looks cheaper.
I'm a Lemmy person. If I had to pick one, that would be it. I'd still be willing to pay $30ish /year for that alone. I seem more willing to pay for things, than most people.