The ISM bands were agreed internationally so that things like microwave ovens could use spectrum without the need for a licence.
In different administrations the rules vary, but they may allow access at very low power for serious experimenters and without the need for a licence. It is possible that WSPR or FT8 could legally be sent in the ISM bands without a licence. Callsigns are arbitrary.
Please check what the rules are in your country. It may be a way of many gaining legal access to bands like 8m for serious experimenters.
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