Oh god, "no transaction support". I wish anyone mentioning that would check, what was the last version missing it and when was it released. As for "how did it

Oh god, "no transaction support". I wish anyone mentioning that would check, what was the last version missing it and when was it released. As for "how did it climb" the answer is simple: replication. Working replication was available in MySQL years ago too. Not perfect, but working. Big companies usually do have competent people who make informed decisions, not based "I've read on the internet that PG is the real DB and MySQL is just a toy".