From memory, the other popular domain name extensions were taken at the time.
Dharma Wheel (the Mahayana/Vajrayana one) is dharmawheel.net
If we had first dibs at all the domain names ever invented it would be easier... but in the absence of that, we have what we have. I think the complete absence of ads and paid memberships is sufficient to demonstrate that the site is not-for-profit.
What is the final conviction that comes when radical attention is razor-edge sharp? That the object of the mind is mind-made (manomaya). (Ven. Ñāṇananda)
Having understood name-and-form, which is a product of prolificity,
And which is the root of all malady within and without,
He is released from bondage to the root of all maladies,
That Such-like-one is truly known as 'the one who has understood'. (Snp 3.6)