Although I do not live there, I have a SIM card from Italy (Fastweb) which for 6€ lets me have 50GB Internet (of which 6GB could be roaming in the rest of Europe), 100 sms and unlimited calls.

In the UK I get a sim-only deal with unlimited calls and 4GB of data for £6 with Smarty: https://smarty.co.uk/plans/4gb-data

Recently moved and didn't have internet service setup yet. I got an unlimited data bundle from them for £17 for 30 days. Felt like a pretty good deal, and it didn't get throttled at all. Latency was a slight issue with zoom calls though.

You don't get that consistently. You can go to check24.de and get their sim.de offer for 5gb data and sms/telephone flat, but that's a limited time deal. So technically yes, but in general you are more in the 8-10€ ballpark for this kind of offering.

I am in France paying 5€ per month to red-by-sfr for 20Go and illimited call/SMS/MMS