Facing Flop Raise MW T8s

I guess we just have to put him on a range and use a calculator.
To call river you need to win it roughly 40% of the times.

I don't know for sure what kind of range this guy can have but I think we can assume recreational player will overplay his Ax here.
If we give him all the possible Ax,99,77,QQ,AA, a lot of better flushes and some weaker flushes (many weaker flushes are quite nicely blocked) you will have 65% equity.

Even if we cut all AXo out of his range you still have that required 40%.

BUT, this seems to be total guessing game. It only depends on how stupid your villain is and how likely he will overplay some hands like weaker flushes on a paired or trips on a flush board.

I would open this preflop. Leadin OTF is fine. River is weird and I think I would find a fold there. The reason is: this is unraised pot and in those we don´t want to play for stack especially if somebody forces us to do so by donking.

Ax,99,77,QQ,AA IMO all of that should raise pre-flop.

SB shows hes strong at all streets and with full houses or higher flushes that beat us i would fold river, otherwise i would play it same as you.

Easy fold river. He is clearly not afraid of the flush at all. I might be calling with K, Q high flushes but T high flush on this board in limped pot is just not good enough to call a whole stack with.

So villain doesn't have auto-top-up. Then he check-raises flop. Then he check-raises turn. Then he bets 2x river. The board is paired with a possible flush. You then estimate on what to base decisions. Calling here is purely exploitative (and very exploitable).