I'm running on a rooted android, magisk, lsposed and minminguard as chain to block ads and remove the ad spaces. I still have to see one ad I didn't want. (And those in games for 'goodies' just run unwatched)
I'll check if sync has ads here, but I doubt I'll see them.
About the type of ads, no app developer has any control over what is shown, as they offerl the space to ad providers and they select the junk they place there.
Edit: Installed sync, added to lsposed list to run the minminguard module on, opened it and 'sponsored content' blocks, but no ads. (Saw one ad when I opened sync without the lsposed config change) I'm guessing I need to restart the device to get rid of the blocks which should hold the ads. (Or those blocks are standard and the regular content is replaced by sponsored content)
Edit 2: those sponsored content blocks are just standard blocks with either the ad or "sponsored content" as text. Uninstalled it again, as I prefer Liftoff.