I do not know which country you are from but you can use leverage on crypto exchanges. Probably your government does not allow it.

There are some exchanges with bots. Also you can build your own.

Same terminal everywhere: All brokers use MetaTrader? It is different on crypto exchanges but I prefer it on crypto exchanges also.

You do not need to use crypto exchanges because I think you are a forex trader and you prefer forex but that does not mean crypto exchanges are bad. I prefer perpetual and futures on crypto exchanges.