This is a clone of another egg-based…
This is a clone of another egg-based startup who promised the same.
Rebel don't run their own network, nor even have their own IP space. They are simply a reseller.
Having placed an order, this was clear by who the gaining provider was. Why is this not made clear on your website?
I do wonder how long it'll be before they increase prices. Openreach have been clear there will be a CPI increase each and every year going forward now since the charge controls set by Ofcom were removed but yet Rebel (a reseller without a direct OR relationship), can promise not to increase pricing, even made comment they've removed this clause from their terms no loss).
Something will have to give, so either the promise is a lie, or they're just building customers to flog to the biggest buyer.
Essentially, website is all marketing spin. Even their signup journey mentions signing up for better wifi, even when you don't select the hardware. Great Q+A!.
Edit: you've updated your review but fail to address the points. Openreach run the infrastructure. As you don't have your own network, who are you using to provide transit across the Openreach network? (hint: OR do not provide IP access and you'd have to use someone like BT Wholesale, Talk Talk Business or Vodafone, or maybe even a further step down to an aggregator - so please be TRANSPARENT!) This would mean you're either not a direct customer of Openreach, thereby being no "partnership" or you have your own equipment and IP ranges (which appears you do not). Do send me an IP and/or AS number that you have so I can verify however.
Let's correct you though. 999 is responsibility of BT, not Openreach.
What you've said is your magic is your hardware, so if you don't opt for that hardware, the connection would be no different yet much more expensive.
In regard, Openreach have been clear on yearly CPI increases as now allowed by Ofcom. How are you not going to increase pricing when Openreach will and that will affect every CP who rely upon them - it's clear you'll have to. So maybe you don't have "plans" but Openreach certainly do and will has made very clear this year.