How did you come across this wallet and is it actually yours? You make it sound a lot like isn't...
It's not mine. I just got some sketchy message on telegram. They sent a bunch of seed phrases. Some with tokens still in them, but that had no liquidity on pancake swap. I've seen withdraws on those wallets within the last 12 hours.
I'm pretty sure the BTC funds are inaccessible.
What's the advantage of a criminal sending me their seed phrase ?
Sometimes they get you to click links. Sometimes they'll take funds in a scammy way as mentioned above. Sometimes they'll hope you save the wallet somewhere and forget to tell the difference between that and your original one. Sometimes they'll just want to check your account is reading messages and is still active (such as to sell your username on as an account that's active/reads messages).
There's probably more reasons but it's worth just checking your notification bar and swiping off messages.