They had high market shares in countries with much smaller populations than the US, so in terms of number of countries (particularly in Europe and South America), it dominated in far more of them than the C64 did.
Right, that ROM BASIC was such a waste for them for years.
Some clone makers quickly found out ways take advantage of that space adding more RAM there. Then bit later it came area where you could even map over 1MB placed memory blocks there with a config.sys loaded driver.
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