Usually they either build their own cloud offerings (and distribute them via AWS/GCP/Azure/Alibaba/etc. marketplaces) and/or cater to the old-school audience that doesn't trust managed cloud services (with enterprise licenses, support, consulting, etc.).
I remember trying the built-in batching but we had some trouble with it, so we just switched to <https://github.com/nikepan/clickhouse-bulk> which works without any issue since then.