They limited the Always Free usage on a completely free account with no card attached. If you switch your account to PAYG, the Always Free instance still maxes at 4vCPUs/24GB of RAM.
That’s actually how I have it set up because they kept running out of capacity in the credit-card-less account and someone on Reddit mentioned that loophole.
It used to be 4 cores and 24GB RAM in the past for at least 4 or 5 years but it recently changed.