Regarding amateur radio, they're governed under part 97, and they're primary users of some of the spectrum that's open for ISM use, so you have to accept interference from them in those cases - not that it's likely you'll run into it.
900MHz is pretty quiet from an amateur radio perspective. There isn't much amateur equipment made for that band so it's mostly adapted commercial hardware. Most of the interference you could get from ham radio takes place below 450MHz and in the 1.2GHz band that's used for amateur satellties. They could theoretically dump 1500W on certain parts of 2.4GHz and 5GHz but I've never heard of anybody running more than a few watts on it with highly directional antennas.
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