Do you think it'd be more clear to only accept donations on GitHub Sponsors and only offer actual support plans on the website? I mean actual email support, helping companies migrate their existing map stack to OpenFreeMap.
If you aren't doing this for a living and getting paid for it, or having someone else do it, you should reconsider either A) providing the support or B) how you make money.
You may think it noble to "only take donations" just to pay the hosting cost, etc. but providing people support is a completely different thing. People are stupid, needy and inconsiderate of your time, feelings and experience.
If you don't want to run ads, great! But your time should be compensated fairly as well. You should be charging businesses for things, with a substantial cost for substantial work. Charging a business is not the same as charging an end user and you should not be averse to doing so.