Well they couldv'e given the FOSS alternatives along with the play apps, now only play apps can be installed from the official appstore

Because their official appstore has Google play store but not any other FOSS alternatives...

They are actually against Fdroid and endorse only play store. ONLY play store is available in their official appstore.

But what about endorsing play store when alternatives are available? Yes it's sandboxes but then also other more open solutions exists

I was saying wouldn't endorsing play store as an approved appstore is bad? Especially there are FOSS alternatives

Firmware I get. But they also endorse play store too

But play store is the only blob that is directly endorsed by devs