I think TextNow offers a better solution and I've been using it to do this for quite some time and it doesn't require any kind of forwarding. I can send/receive calls and messages directly from within its app and recycle numbers at any time - all for free (ad supported). Calls are of great quality too and it even includes voicemail. If I really like a number and want to lock it (to also receive 2FA codes), it's a yearly $7 fee. Works with area codes in US and Canada.

I think there are other options like Fongo and probably a dozen other similar services that already have been doing this for some time. Not really seeing the value proposition of going with the Mozilla option here. Am I missing something?