There are actually two tiers of Free here that Oracle offers.
Always Free - No credit card required, sign up. This is what the new limit applies to
PAYG - You give a credit card, but like AWS and GCP there is a "free" tier for people who are on pay as you go plans. From what I can tell, the PAYG subscribers are not subject to this lower limit, only Always Free users.
In other words, if you want the old provisioning limits for free you just have to put your credit card info in.
There are additional reasons that you would want to switch to PAYG - for instance, oracle will literally tear down your always free resources if you are idling them, they are watching CPU and memory and if they see them idled they will take them away. Also, even provisioning always free instances is a challenge - most people have to write bots that attempt on a regular basis, since they appear to only allow you to register when existing resources are freed up, either by the reaper referenced earlier or by someone deprovisioning their always free resources. Neither of these limitations apply on the PAYG tier
It's worth clearing up, because this amount of free resources is worth a nonzero amount of money, if you provisioned comparable resources on any of the tier 1 or tier 2 cloud's you would be paying well over $1k/year for what they are handing over for free. AWS + GCP free compute offerings are anemic in comparison. It's a significant amount of compute.