Credetials is not enforced, at least in the case of an algorithm

[rogargon]

Describe the bug

After publishing an algorithm and restricting its use using the credentials feature:

{
"allow": [
{
"type": "address",
"values": ["0x620...6822"]
}
],
"deny": []
}

The credentials are not enforced and the algorithm can be run by other users different from the allowed one.

To Reproduce
Tested in the context of the Pontus-X project which uses as default provider https://provider.v4.genx.delta-dao.com, which is on version 1.3.12.

The algorithm was published using the Nautilus library, which allows to set the credentials restriction programmatically, as it is not available from the Market front end.

Not able to test if this issue is still present in version 2.1.0, though I've been unable to find any issue related to this problem addressed from version 1.3.12.

Expected behavior
Just the users explicitly granted access through credentials can execute the algorithm.

[LoznianuAnamaria]

@mariacarmina Once we fix this, let's test how the market behaves