Ofc you can stop DDoS by buyin a expensiver dedicated, no question...
But would YOU buy a server for 250€ each month for lettin players playin for FREE?
And I think there is no oldschool Server except RealOTS that can handle a dedicated by donations...
Im earning alot of cash IRL, still I wouldnt pay 200€+ for a server to let players play for free, thats a waste of more then 2000€ in year for nothing...
Anyway Im hoping the best for you Fribben and may your Server run well