ISM band access licence free?

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.