Option max is used to regulate the size or even type of a text field

[nhovratov]

As Content Blocks adds everything into overrideChildTca, a change in max won't be reflected in the db schema. But exluding it from there is bad as well, as sometimes you want to override fields and set an alternative max value (e.g. shrink the allowed size, but keep the original size for other elements which use the field).

A proper solution from Core would be to introduce an option in parallel to max. E.g. dbType => text or dbLength => 200