I can only speak from a UK perspective, but most home ADSL/VDSL/Fibre providers don’t have limits, other than “if your usage is tanking the network, we’ll ask you to knock it off” type clauses.

Most providers are also signed up to an agreement that if your speed drops 50% below the agreed speed on the package on average, they’ll either give you refunds, or let you out of the contract.

The only ones that throttle are the bargain basement operators aimed at people who don’t care, and one otherwise very competent provider that for some unexplainable reason only gives 1TB by default, charging an extra £10 for 10TB.

And I guess there is also a pricing step up to guaranteed bandwidth. For business use, they tend to be things like 1gbits headline, 500mbit guaranteed burst, 100mbit guaranteed sustained.